TPS - MIL ON/DTC P0732 and P0733 Stored

Classification:
AT97-001

Reference:
ITB97-021

Date:
April 16, 1997

DIAGNOSTIC PROCEDURE FOR P0731, P0732 & P0733 (A/T SIGNALS)
WITH NO DRIVEABILITY INCIDENTS

APPLIED VEHICLES:

1996 & later I30 (CA32)
1996 & later Q45 (G50)
All QX4 (JR50)
1996 & later J30 (JY32)
1996 G20 (P10)

APPLIED TRANSMISSION:
Vehicles with automatic transmissions only

SERVICE INFORMATION

If an applied vehicle has a MIL "on" condition with P0731, P0732 or P0733 stored with no driveability incidents, use the procedure in this bulletin to diagnose and repair the incident.

These codes can be retrieved only in the ENG SYST section of CONSULT. These codes will not be recorded in the AFT SYST section of CONSULT.

SERVICE PROCEDURE

Confirmation

1. Connect CONSULT. Confirm the throttle position sensor (TPS) setting is correct as follows:

2. Bring the engine to normal operating temperature.





3. Select AFT, then DATA MONITOR then SELECTION FROM MENU (see Figure 1).

4. Select VHCL/S SE A/T, THRTL POS SEN and ENGINE SPEED.

5. Then select CLOSED THL/SW, GEAR, THROTTLE POSI and VEHICLE SPEED. Press ENTER to save these selections.

6. Press Settings and select HI SPEED/MANU TRIG. Press START and watch the data.

7. Road test the vehicle. Accelerate to approximately 40 mph. Release the throttle until the CONSULT shows the CLOSED THL/SW is in the "ON" position.

8. Let the vehicle coast and push RECORD on CONSULT (data). When the recording is completed, display the record on CONSULT and look for a voltage increase at the TPS output.

^ The TPS voltage with close throttle switch "ON" should be within the service manuals specifications (refer to the AT section of the appropriate service manual).

^ The TPS voltage should never go above the service manual idle specification when the close throttle switch is "ON".

Root Cause (example - main concern is the TPS voltage)





The automatic transmission control unit (ATCU) uses the TPS voltage to monitor driving conditions (acceleration or deceleration). When the TPS voltage increases above 1.0 volts (with close throttle switch "ON" & vehicle in deceleration) the ATCU goes into diagnostic for A/T signals. If the ATCU does not see an increase in vehicle speed within 3 seconds, an A/T signal DTC will be tripped (see Figure 2, engine speed and throttle position are not shown).

Repair

1. If you can duplicate the MIL "on" incident with the Confirmation procedure, replace the TPS to resolve the incident.

2. You must adjust the TPS after installation. Refer to the EC section under Basic Inspection in the appropriate service manual.

3. After the TPS adjustment, you must re-set the idle position memory. Refer to the EC section under Basic Inspection, RESET IDLE POSITION MEMORY in the appropriate service manual.

4. After resetting the idle position, verify the engine RPM at idle.





PARTS INFORMATION

WARRANTY INFORMATION

When applicable, normal claims coding applies.