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. 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. AT AT AT AT .
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. AT
OK or NG
OK or NG OK (With CONSULT-III)-GO TO 3.
OK (Without CONSULT-III)-GO TO 4.
NG - Check overdrive control switch. Component Inspection .
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. Component Inspection .
4. CHECK TRANSMISSION RANGE 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.
ns10versa_Tat203-001
B: Battery voltage
0: 0V
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OK or NG
OK - GO TO 5
NG - Check transmission range switch. Refer to AT-175, "Component Inspection" . Component Inspection .
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. AT AT AT AT AT 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 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. Inspections Before Trouble Diagnosis .
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. Low & Reverse Brake
OK or NG
OK - GO TO 10.
NG - Repair or replace damaged parts.
10.CHECK SYMPTOM
Check again. Cruise Test - Part 3 .
OK or NG
OK - INSPECTION END
NG - GO TO 11.
11.CHECK TCM
1. Check TCM input/output signals. TCM Terminal And Reference Value .
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.