Vehicle Does Not Decelerate By Engine Brake

Vehicle Does Not Decelerate By Engine Brake

SYMPTOM: No engine brake is applied when the gear is shifted from the 2[2] to 1[1].

DIAGNOSTIC PROCEDURE
1. CHECK SELF-DIAGNOSIS RESULTS
Perform self-diagnosis.
Do the self-diagnosis results indicate PNP switch, ATF pressure switch 5?
YES >> Check the malfunctioning system. Refer to DTC P0705 PARK/NEUTRAL POSITION SWITCH, DTC P1845 ATF PRESSURE SWITCH 5.
NO >> GO TO 2.

2. CHECK 1ST POSITION SWITCH CIRCUIT

With CONSULT-II








1. Turn ignition switch ON.
2. Select ECU INPUT SIGNALS in DATA MONITOR mode for A/T with CONSULT-II.
3. Read out OVERDRIVE SW switch moving selector lever to each position.

Without CONSULT-II








1. Turn ignition switch ON. (Do not start engine)
2. Check voltage between A/T device harness connector terminal and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.

3. CHECK A/T FLUID LEVEL





Check the A/T fluid level. Refer to Checking A/T Fluid.
OK or NG
OK >> GO TO 4.
NG >> Refill ATF.

4. CHECK CONTROL CABLE





Check the control cable.
^ Refer to Checking of A/T Position.
OK or NG
OK >> GO TO 5.
NG >> Adjust control cable. Refer to Adjustment of A/T Position.

5. CHECK A/T FLUID CONDITION





1. Remove oil pan. Refer to Control Valve With TCM and A/T Fluid Temperature Sensor 2
2. Check A/T fluid condition. Refer to Fluid Condition Check.
OK or NG
OK >> GO TO 6.
NG >> GO TO 9.

6. DETECT MALFUNCTIONING ITEM
^ Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to Symptom Chart (Symptom No.58).
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.

7. CHECK SYMPTOM
Check again. Refer to Cruise Test - Part 3.
OK or NG
OK >> INSPECTION END
NG >> GO TO 8.

8. PERFORM TCM INSPECTION
1. Perform TCM input/output signals inspection. Refer to AT-84, TCM Input/Output Signal Reference Values. Pinout Values and Diagnostic Parameters
2. If NG, recheck A/T assembly harness connector terminals for damage or loose connection with harness connector.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.

9. DETECT MALFUNCTIONING ITEM
^ Check the malfunction items. If any items are damaged, repair or replace damaged parts. Refer to Symptom Chart (Symptom No.58).
OK or NG
OK >> GO TO 7.
NG >> Repair or replace damaged parts.