DR-1A CODE to DR TEST Chart (Checking for Fault Codes)
Perform VISUAL INSPECTION Before ProceedingNOTE: The battery must be charged and at rated capacity before performing any driveability test procedure.
If the vehicle starts and stalls repeatedly, perform Test NS-2A.
Connect the DRBII to the underhood diagnostic connector and then read fault messages. Refer to SCAN TOOL (DRBII) ORIENTATION for assistance.
If the message is "NO FAULTS" do the following:
1. START the engine.
2. Allow the engine to reach normal operating temperature.
3. Set the engine speed to 2000 RPM for at least 10 seconds. NOTE: Set the speed manually, not with the DRBII.
4. Return the engine to idle speed.
5. If the vehicle is equipped with air conditioning, put the air conditioning fan on low speed. Turn the air conditioning ON. Should the vehicle stall when the air conditioning is turned on, do the following:
a. Ignition key OFF.
b. Disconnect the engine controller connector.
c. Inspect the connector.
d. If the connection is not OK, repair as necessary.
e. Ignition key ON.
f. Put the DRBII in voltmeter mode.
g. Probe the engine controller connector DB wire at cavity 9.
h. If there are fewer than 10 volts, repair the open DB wire.
i. If there are more than 10 volts, replace the engine controller.
j. Perform VER-2.
6. If the vehicle is equipped with an automatic transmission, step on the brake and shift through all gears. Return to PARK.
7. Read faults with the DRBII.
NOTE: If the DRBII once again shows "NO FAULTS", check all TECHNICAL SERVICE BULLETINS that relate to this driveability problem.
If there is a pertinent TSB or Newsletter, perform the corrective action described in the correspondence.
NOTE: If driveability problems continue after following the TSB procedure, perform TEST DR-31A.
If there isn't a pertinent TSB or Newsletter, perform TEST DR-31A.
If the DRBII message is "INTERNAL CONTROLLER FAILURE", do the following:
1. Replace the engine controller.
2. Perform VER-2.
If the DRBII message is "ENGINE IS COLD TOO LONG", do the following:
1. Perform the repairs necessary to bring the cooling system into specifications.
2. Perform VER-3.
FAULT CODES AND RELATED TESTS
SCAN TOOL MESSAGE HARD INTERMITTENT
FAULT FAULT
SLOW CHANGE IN IDLE MAP SIGNAL DR-2A DR-47B
NO CHANGE IN MAP FROM START TO RUN DR-3A DR-47B
MAP VOLTAGE TOO LOW DR-4A DR-47B
MAP VOLTAGE TOO HIGH DR-5A DR-47B
NO VEHICLE SPEED SIGNAL DR-6A DR-6A
02 SIGNAL STAYS AT CENTER DR-7A DR-7A
02 SIGNAL SHORTED TO VOLTAGE DR-8A DR-8A
COOLANT SENSOR VOLTAGE TOO HIGH DR-9A DR-47A
COOLANT SENSOR VOLTAGE TOO LOW DR-10A DR-47A
THROTTLE BODY TEMP VOLTAGE HIGH DR-11A DR-47A
THROTTLE BODY TEMP VOLTAGE LOW DR-12A DR-47A
THROTTLE POSITION SENSOR VOLTAGE HIGH DR-13A DR-47A
THROTTLE POSITION SENSOR VOLTAGE LOW DR-14A DR-47A
AUTOMATIC IDLE SPEED MOTOR CIRCUITS DR-15A DR-48A
INJECTOR #1 CONTROL CIRCUIT DR-16A DR-49A
INJECTOR #2 CONTROL CIRCUIT DR-17A DR-49A
PURGE SOLENOID CIRCUIT DR-18A DR-46A
EGR SOLENOID CIRCUIT DR-19A DR-46A
EGR SYSTEM FAILURE DR-20A DR-20A
A/C CLUTCH RELAY CIRCUIT DR-21A DR-46A
IDLE SWITCH SHORTED LOW DR-23A DR-23A
IDLE SWITCH OPEN CIRCUIT DR-24A DR-24A
AIR SWITCHING SOLENOID CIRCUIT DR-25A DR-46A
TORQUE CONVERTER LOCKUP SOLENOID CKT DR-26A DR-46A
NO ASD RELAY VOLTAGE SENSE AT CONTROLLER DR-27A DR-27A
OVERDRIVE SOLENOID CIRCUIT (W/O LOCKUP) DR-28A DR-28A
OVERDRIVE SOLENOID CIRCUIT (W/ LOCKUP) DR-29A DR-29A
CONTROLLER FAILURE EMR MILES NOT STORED DR-30A DR-30A
CONTROLLER FAILURE EEPROM WRITE DENIED DR-30A DR-30A
02 SIGNAL STAYS BELOW CENTER (LEAN) DR-31A DR-31A
02 SIGNAL STAYS ABOVE CENTER (RICH) DR-31A DR-31A
ADDITIVE ADAPTIVE MEMORY AT RICH LIMIT DR-31A DR-31A
ADDITIVE ADAPTIVE MEMORY AT LEAN LIMIT DR-31A DR-31A