Circuit Information
IGNITION SWITCHWhen the ignition switch is in the START or RUN position, it connects circuit A1 from fuse 5 in the Power Distribution Center (PDC) to circuit A21.
Circuit A21 feeds circuit F87 through the 9 amp positive temperature coefficient (PTC No.1) in the junction block. Circuit F87 supplies voltage to the Torque Convertor Clutch (TCC) solenoid, EVAP/Purge Solenoid, EGR Solenoid, and EVAP leak detection pump solenoid. Circuit F87 also supplies battery voltage to the coil side of the fuel pump relay and connects to the junction block.
BATTERY FEED
Circuit A14 from fuse 13 in the Power Distribution Center (PDC) supplies battery voltage to cavity 46 of the Powertrain Control Module (PCM).
Helpful Information
Circuit A14 connects to a bus bar in the PDC that the battery feeds. Circuit A14 powers the Automatic Shut Down (ASD) relay and fuel pump relay. The A14 circuit also splices to the data link connector.
POWER (DEVICE) GROUND
Circuit Z12 attaches to cavity 10 of the PCM and circuit Z11 connects to cavity 50 of the PCM. The Z11 and Z12 circuits provide ground for PCM internal drivers that operate high current devices like the injectors and ignition coils.
Helpful Information
If the system loses ground for circuits Z11 and Z12, the vehicle will not operate.
DATA LINK CONNECTOR
Circuit M1 from fuse 10 in the Power Distribution Center (PDC) supplies battery voltage to the data link connector. A twisted pair of wires, circuits D1 and D2 connect the data link connector to the CCD Bus.
Ground circuit Z11 splices to the data link connector. Circuit Z11 splices to circuit Z12. Both circuit connect to the PCM. Circuit Z2 also connects to the data link connector.
Circuit D20 connects to cavity 75 of the PCM. Circuit D20 is the SCI receive circuit for the PCM.
Circuit D21 connects to cavity 65 of the PCM. Circuit D21 is the SCI transmit circuit for the PCM. The D21 circuit splices to the Transmission Control Module (TCM).
Helpful Information
Circuit Z12 also supplies ground for the PCM high current drivers and has the same termination point as circuit Z11.
If the system loses ground for circuits Z11 and Z12, the vehicle will not operate.
AUTOMATIC SHUT DOWN RELAY
Circuit A0 from the bus bar in the Power Distribution Center (PDC) supplies battery voltage to the coil side of the Automatic Shut Down (ASD) relay. The Powertrain Control Module (PCM) controls the relay by supplying ground for the coil side on circuit K51. Circuit K51 connects to cavity 67 of the PCM.
When the PCM grounds the ASD relay, contacts inside the relay CLOSE and connect circuit #4 from fuse 12 in the PDC to circuit A142. Circuit A142 supplies battery voltage to the generator field, ignition coils, fuel injectors, and the heater elements in the heated oxygen sensors. Circuit A142 also connects to cavity 6 of the PCM.
FUEL PUMP RELAY
When the ignition switch is in the START or RUN position, it connects circuit A1 from fuse 5 in the Power Distribution Center (PDC) to circuit A21.
Circuit A21 feeds circuit F87 through the 9 amp positive temperature coefficient (PTC No.1) in the junction block. Circuit F87 supplies voltage to the coil side of the fuel pump relay.
The Powertrain Control Module (PCM) controls the relay by supplying ground for the coil side on circuit K31. Circuit K31 connects to cavity 74 of the PCM.
When the PCM grounds the fuel pump relay, contacts inside the relay CLOSE and connect circuit A14 from fuse 13 in the PDC to circuit A141. Circuit A141 supplies battery voltage to the in-tank fuel pump. Circuit Z1 provides ground for the fuel pump motor.
Helpful Information
- Circuit A14 also connects directly to the PCM at cavity 46.
HEATED OXYGEN SENSORS
When the Automatic Shut Down (ASD) relay contacts CLOSE, they connect circuit #4 from the Power Distribution Center (PDC) to circuit A142. Circuit A142 supplies battery voltage to the heated oxygen sensors. The Powertrain Control Module (PCM) controls the ground circuit of ASD relay coil.
Circuit A142 splices to supply voltage for the heater elements in the upstream and downstream heated oxygen sensors. Circuit K41 delivers the signal from the upstream heated oxygen sensor to the PCM. Circuit K41 connects to cavity 30 of the PCM.
Circuit K141 delivers the signal from the down- stream heated oxygen sensor to the PCM. Circuit K141 connects to cavity 51 of the PCM.
The PCM provides a ground for the upstream and downstream heated oxygen sensor signals (circuit K41 and K141) through circuit K4. Circuit K4 connects to pin 43 of the PCM connector and pin 3 the upstream and downstream heated oxygen sensor connectors.
Circuit Z1 provides ground for the upstream heated oxygen sensor. Circuit Z12 provides ground for the downstream heated oxygen sensor.
Helpful Information
Circuit A142 splices to supply voltage to the fuel injectors, ignition coil and generator field.
Circuit K4 also splices to supply ground for the signals from the following:
- Crankshaft position sensor
- Camshaft position sensor
- Throttle position sensor
- Manifold absolute pressure sensor
- Engine coolant temperature sensor
- Knock sensor
- Intake air temperature sensor
CRANKSHAFT POSITION SENSOR
Circuit K7 supplies 8 volts from the Powertrain Control Module (PCM) to the crankshaft position sensor. The K7 circuit originates at cavity 44 of the PCM connector.
Circuit K24 from the sensor provides an input signal to the PCM. The K24 circuit connects to cavity 32 of the PCM. On vehicles equipped with an electronically controlled automatic trans axle, circuit K24 splices to the transmission control module.
The PCM provides ground for the crankshaft position sensor signal (circuit K24) through circuit K4. Circuit K4 connects to cavity 43 of the PCM.
Helpful Information
Circuit K7 also splices to supply 8 volts to the camshaft position sensor and vehicle speed sensor.
Circuit K4 also splices to supply ground for the signals from the following:
- Upstream heated oxygen sensor
- Downstream heated oxygen sensor
- Camshaft position sensor
- Throttle position sensor
- Manifold absolute pressure sensor
- Engine coolant temperature sensor
- Knock sensor
- Intake air temperature sensor
- Vehicle speed sensor
CAMSHAFT POSITION SENSOR
Circuit K7 supplies 8 volts from the Powertrain Control Module (PCM) to the camshaft position sensor. The K7 circuit originates at cavity 44 of the PCM connector.
Circuit K44 from the sensor provides an input signal to the PCM. The K44 circuit connects to cavity 33 of the PCM.
The PCM provides ground for the camshaft position sensor signal (circuit K44) through circuit K4. Circuit K4 connects to cavity 43 of the PCM.
Helpful Information
Circuit K7 also splices to supply 8 volts to the crankshaft position sensor and vehicle speed sensor.
Circuit K4 also splices to supply ground for the signals from the following:
- Upstream heated oxygen sensor
- Downstream heated oxygen sensor
- Crankshaft position sensor
- Throttle position sensor
- Manifold absolute pressure sensor
- Engine coolant temperature sensor
- Knock sensor
- Intake air temperature sensor
- Vehicle speed sensor
ENGINE COOLANT TEMPERATURE SENSOR
The engine coolant temperature sensor provides an input to the Powertrain Control Module (PCM) on circuit K2. Circuit K2 connects to cavity 26 of the PCM.
From circuit K2 the engine coolant temperature sensor draws up to 5 volts from the PCM. The sensor is a variable resistor. As coolant temperature changes, the resistance in the sensor changes causing a change in current draw.
The PCM provides ground for the engine coolant temperature sensor signal (circuit K2) through circuit K4. Circuit K4 connects to cavity 43 of the PCM.
Helpful Information
Circuit K4 also splices to supply ground for the signals from the following:
- Upstream heated oxygen sensor
- Downstream heated oxygen sensor
- Camshaft position sensor
- Crankshaft position sensor
- Throttle position sensor
- Manifold absolute pressure sensor
- Knock sensor
- Intake air temperature sensor
- Vehicle speed sensor
THROTTLE POSITION SENSOR
From the Powertrain Control Module (PCM), circuit KS supplies 5 volts to the Throttle Position Sensor (TPS). Circuit KS connects to cavity 61 of the PCM.
Circuit K22 delivers the TPS signal to the PCM. Circuit K22 connects to cavity 35 of the PCM. On vehicle~ equipped with an electronically controlled automatic transaxle, circuit K22 splices to the Transmission Control Module (TCM).
The PCM provides ground for the TPS signal (circuit K22) through circuit K4. Circuit K4 connects to cavity 43 of the PCM.
Helpful Information
Circuit KS splices to supply 5 volts to the manifold absolute pressure sensor and NC pressure switch.
Circuit K4 also splices to supply ground for the signals from the following:
- Upstream heated oxygen sensor
- Downstream heated oxygen sensor
- Camshaft position sensor
- Crankshaft position sensor
- Engine coolant temperature sensor
- Manifold absolute pressure sensor
- Knock sensor
- Intake air temperature sensor
- Vehicle speed sensor
MANIFOLD ABSOLUTE PRESSURE SENSOR
From the Powertrain Control Module (PCM), circuit KS supplies 5 volts to the Manifold Absolute Pressure MAP) sensor. Circuit KS connects to cavity 61 of the PCM.
Circuit K1 delivers the MAP signal to the PCM. Circuit K1 connects to cavity 36 of the PCM.
The PCM provides ground for the MAP signal (circuit K1) through circuit K4. Circuit K4 connects to cavity 43 of the PCM.
Helpful Information
Circuit KS splices to supply 5 volts to the throttle position sensor and NC pressure switch.
Circuit K4 also splices to supply ground for the signals from the following:
- Upstream heated oxygen sensor
- Downstream heated oxygen sensor
- Camshaft position sensor
- Crankshaft position sensor
- Engine coolant temperature sensor
- Throttle position sensor
- Knock sensor
- Intake air temperature sensor
- Vehicle speed sensor
KNOCK SENSOR
The knock sensor provides an input to the Power- train Control Module (PCM) on circuit K42. Circuit K42 connects to cavity 24 of the PCM.
The PCM provides ground for the knock sensor signal (circuit K42) through circuit K4. Circuit K4 connects to cavity 43 of the PCM connector.
Helpful Information
Circuit K4 also splices to supply ground for the signals from the following:
- Upstream heated oxygen sensor
- Downstream heated oxygen sensor
- Camshaft position sensor
- Crankshaft position sensor
- Engine coolant temperature sensor
- Throttle position sensor
- Intake air temperature sensor
- Manifold absolute pressure sensor
- Vehicle speed sensor
FUEL INJECTORS
When the ASD relay contacts CLOSE, they connect circuit #4 to circuit A142. Circuit A142 supplies battery voltage to the fuel injectors. The Powertrain Control Module (PCM) controls the ground circuit of each injector.
- Circuit K11 is the ground circuit for injector number one. Circuit K11 connects to cavity 13 of the PCM.
- Circuit K12 is the ground circuit for injector number two. Circuit K12 connects to cavity 17 of the PCM.
- Circuit K13 is the ground circuit for injector number three. Circuit K13 connects to cavity 7 of the PCM.
- Circuit K14 is the ground circuit for injector number four. Circuit K14 connects to cavity 16 of the PCM.
- Circuit K38 is the ground circuit for injector number five. Circuit K38 connects to cavity 15 of the PCM.
- Circuit K58 is the ground circuit for injector number six. Circuit K58 connects to cavity 14 of the PCM.
Helpful Information
- Circuit A142 splices to the ignition coil, upstream and downstream heated oxygen sensors, generator field and cavity 6 of the PCM
- The injectors operate in sequence.
- Circuit A142 splices to the ignition coil, upstream and downstream heated oxygen sensors. generator field and cavity 6 of the PCM
- The injectors operate in sequence.
IGNITION COIL PACK
The ignition coils are molded together. Each coil fires two spark plugs at one time. One cylinder is beginning its compression stroke, the other its exhaust stroke. Refer to Ignition System, for system operation.
When the Automatic Shut Down (ASD) relay contacts CLOSE, they connect circuit #4 to circuit A142. Circuit A142 supplies battery voltage to the ignition coils. The Powertrain Control Module (PCM) controls the ground circuit of each coil.
- Circuit K19 is the ground circuit for the ignition coil that fires spark plugs one and four. Circuit K19 connects to cavity 11 of the PCM.
- Circuit K17 is the ground circuit for the ignition coil that fires spark plugs two and five. Circuit K17 connects to cavity 3 of the PCM.
- Circuit K18 is the ground circuit for the ignition coil that fires spark plugs three and six. Circuit K18 connects to cavity 2 of the PCM.
Helpful Information
Circuit A142 splices to supply voltage to the fuel injectors, generator field, upstream heated oxygen sensor and downstream heated oxygen sensor. Circuit A142 also connects to cavity 6 of the PCM.
IDLE AIR CONTROL MOTOR
The Powertrain Control Module (PCM) operates the Idle Air Control (IAC) motor through 4 circuits - K59, K60, K40, and K39. Each circuit connects to separate cavities of the PCM connectors.
- Circuit K59 connects to cavity 58.
- Circuit K60 connects to cavity 49.
- Circuit K40 connects to cavity 48.
- Circuit K39 connects to cavity 57.
DUTY CYCLE EVAP/PURGE SOLENOID
Circuit F87 supplies battery voltage to the duty cycle EVAP/Purge solenoid. The Powertrain Control Module (PCM) switches the ground path for the solenoid ON and OFF on circuit K52. Circuit K52 connects to cavity 68 of the PCM.
In the START or RUN position, the ignition switch connects circuit Al from fuse 5 in the Power Distribution Center (PDC) to circuit A21. Circuit A2l feeds circuit F87 through the 9 amp Positive Temperature Coefficient (PTC No.1) in the junction block.
Helpful Information
Circuit F87 splices to feed Torque Converter Clutch (TCC) solenoid, EGR solenoid, PCM, and the coil side of the fuel pump relay.
EGR SOLENOID
Circuit F87 supplies battery voltage to the EGR solenoid. The Powertrain Control Module (PCM) switches the ground path for the solenoid ON and OFF on circuit K35. Circuit K35 connects to cavity 40 of the PCM.
In the START or RUN position, the ignition switch connects circuit Al from fuse 5 in the Power Distribution Center (PDC) to circuit A21. Circuit A21 feeds circuit F87 through the 9 amp positive temperature coefficient (PTC No.1) in the junction block.
Helpful Information
Circuit F87 splices to feed Torque Converter Clutch (TCC) solenoid, EVAP/Purge solenoid, PCM, and the coil side of the fuel pump relay.
TORQUE CONVERTER CLUTCH (TCC) SOLENOID
Circuit F87 supplies battery voltage to the TCC solenoid. The Powertrain Control Module (PCM) switches the ground path for the solenoid ON and OFF on circuit K54. Circuit K54 connects to cavity 56 of the PCM.
In the START or RUN position, the ignition switch connects circuit Al from fuse 5 in the Power Distribution Center (PDC) to circuit A21. Circuit A21 feeds circuit ~87 through the 9 amp Positive Temperature Coefficient (PTC No.1) in the junction block.
EVAP LEAK DETECTION PUMP SOLENOID
Circuit F87 supplies battery voltage to the EVAP leak detection pump solenoid. The Powertrain Control Module (PCM) controls the ground path for the solenoid on circuit K106. Circuit K106 connects to cavity 77 of the PCM.
The PCM also monitors the position of the leak detection pump diaphragm on circuit K107. Circuit 107 connects to cavity 72 of the PCM.
In the START or RUN position, the ignition switch connects circuit A1 from fuse 5 in the Power Distribution Center (PDC) to circuit A21. Circuit A21 feeds circuit F87 through the 9 amp Positive Temperature Coefficient (PTC No.1) in the junction block.
VEHICLE SPEED INPUT
If the vehicle is equipped with an automatic transaxle, the Transmission Control Module (TCM) transmits the vehicle speed signal to the Powertrain Control Module (PCM) on circuit G7. Circuit G7 originates at cavity 58 of the TCM and connects to cavity 66 of the PCM.