Vehicle Does Not Decelerate By Engine Brake

TROUBLE DIAGNOSIS FOR SYMPTOMS


Vehicle Does Not Decelerate by Engine Brake


SYMPTOM:
- Vehicle does not decelerate by engine brake when shifting from 22 (12 ) to 11"Cruise Test -- Part 3".
- Vehicle does not decelerate by engine brake when OD OFF (OD OFF indicator lamp is on) on "Cruise
Test -- Part 3".
- Vehicle does not decelerate by engine brake when shifting A/T from "D" to "2" position on "Cruise
Test -- Part 3".

DIAGNOSTIC PROCEDURE
1.CHECK CAN COMMUNICATION LINE
Perform self-diagnosis. Automatic Transmission or Automatic Transmission .
Is a malfunction in CAN communication indicated in the results?
YES - Check CAN communication line. Automatic Transmission.
NO - GO TO 2.
2.CHECK OVERDRIVE CONTROL SWITCH CIRCUIT
With CONSULT-III
1. Turn ignition switch ON. (Do not start engine)
2. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
3. Read out "OVERDRIVE SW".
Check the signal of the overdrive control switch is indicated properly.






Without CONSULT-III
1. Turn ignition switch ON. (Do not start engine)






2. Check voltage between A/T shift selector harness connector terminal and ground. Refer to Non DTC.







OK or NG
OK (With CONSULT-III) - GO TO 3.
NG - Check overdrive control switch. Refer to TR Sw, OD Sw And Closed Throttle, Wide Open Throttle Position Signal Circuit.

3.CHECK TRANSMISSION RANGE SWITCH CIRCUIT
With CONSULT-III
1. Turn ignition switch ON. (Do not start engine)
2. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT-III.
3 Read out "P�N", "R", "D", "2" and "1" position switches moving selector lever to each position.






OK or NG
OK - GO TO 5
NG - Check transmission range switch. Refer to AT-175, "Component Inspection" .

4.CHECK TRANSMISSION RANGE SWITCH CIRCUIT
Without CONSULT-III
1. Turn ignition switch ON. (Do not start engine)
2. Check voltage between A/T shift selector harness connector terminal and ground. Wiring Diagram - AT - TR/SW" .










OK or NG
OK - GO TO 5
NG - Check transmission range switch. TR Sw, OD Sw And Closed Throttle, Wide Open Throttle Position Signal Circuit .
5.CHECK A/T POSITION
Check A/T position. Testing and Inspection .
OK or NG
OK - GO TO 6.
NG - Adjust A/T position. Adjustments .
6.CHECK OUTPUT SPEED SENSOR AND VEHICLE SPEED SIGNAL CIRCUIT
Check output speed sensor and vehicle speed signal circuit. Output Speed Sensor and/or Vehicle Speed Signal.
OK or NG
OK - GO TO 7.
NG - Repair or replace output speed sensor and/or vehicle speed signal circuits.
7.CHECK ACCELERATOR PEDAL POSITION SENSOR
Check accelerator pedal position sensor. P2138 (HR16DE), P2138 (MR18DE).
OK or NG
OK - GO TO 8.
NG - Repair or replace accelerator pedal position sensor.
8.CHECK A/T FLUID CONDITION
1. Remove oil pan. Component .
2. Check A/T fluid condition. Automatic Transmission .
OK or NG
OK - GO TO 10.
NG - GO TO 9.
9.DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Service and Repair .
2. Check the following.
- Shift valve A
- Overrun clutch solenoid valve
3. Disassemble A/T. Disassembly .
4. Check the following.
- Overrun clutch assembly. Forward And Overrun Clutches .
- Low & reverse brake assembly. .
OK or NG
OK - GO TO 10.
NG - Repair or replace damaged parts.
10.CHECK SYMPTOM
Check again. Automatic Transmission .
OK or NG
OK - INSPECTION END
NG - GO TO 11.
11.CHECK TCM
1. Check TCM input/output signals. Automatic Transmission .
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK - INSPECTION END
NG - Repair or replace damaged parts.