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. Refer to CONSULT-III Function (A/T) or Diagnosis Procedure Without CONSULT-III .
Is a malfunction in CAN communication indicated in the results?
YES >> Check CAN communication line. Refer to 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 device harness connector terminal and ground. Refer to Wiring Diagram - AT - NonDTC .





OK or NG
OK (With CONSULT-III)>>GO TO 3.
OK (Without CONSULT-III)>>GO TO 4.
NG >> Check overdrive control switch. Refer to Component Inspection .
3.CHECK PNP 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 PNP switch. Refer to Component Inspection .
4.CHECK PNP SWITCH CIRCUIT
Without CONSULT-III
1. Turn ignition switch ON. (Do not start engine.)
2. Check voltage between TCM connector terminals and ground while moving selector lever through each position. Refer to Automatic Transmission .










OK or NG
OK >> GO TO 5
NG >> Check PNP switch. Refer to Component Inspection .
5.CHECK A/T POSITION
Check A/T position. Refer to Testing and Inspection .
OK or NG
OK >> GO TO 6.
NG >> Adjust A/T position. Refer to Adjustments .
6.CHECK VEHICLE SPEED SENSOR�A/T AND VEHICLE SPEED SENSOR�MTR CIRCUIT
Check vehicle speed sensor�A/T (revolution sensor) and vehicle speed sensor�MTR circuit. Refer to Automatic Transmission and/or Description CONSULT-III Reference Value In Data Monitor Mode On Board Diagnosis Logic Possible Cause DTC Confirmation Procedure .
OK or NG
OK >> GO TO 7.
NG >> Repair or replace vehicle speed sensor�A/T (revolution sensor) and/or vehicle speed sensor�MTR circuits.
7.CHECK ACCELERATOR PEDAL POSITION SENSOR
Check accelerator pedal position sensor. Refer to P2138 (HR16DE), P2138 (MR Type 1) or P2138 (MR Type 2).
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. Refer to Component .
2. Check A/T fluid condition. Refer to Inspections Before Trouble Diagnosis .
OK or NG
OK >> GO TO 10.
NG >> GO TO 9.
9.DETECT MALFUNCTIONING ITEM
1. Remove control valve assembly. Refer to Service and Repair .
2. Check the following.
- Shift valve A
- Overrun clutch solenoid valve
3. Disassemble A/T. Refer to Disassembly .
4. Check the following.
- Overrun clutch assembly. Refer to Forward And Overrun Clutches .
OK or NG
OK >> GO TO 10.
NG >> Repair or replace damaged parts.
10.CHECK SYMPTOM
Check again. Refer to Cruise Test - Part 3 .
OK or NG
OK >> INSPECTION END
NG >> GO TO 11.
11.CHECK TCM
1. Check TCM input/output signals. Refer to Pinout Values and Diagnostic Parameters .
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.