MIL On and DTC 45 in PCM Memory. Saturn Saturn 1995

For 1990-2009 cars

# MIL On and DTC 45 in PCM Memory

Subject: | Malfunction Indicator Lamp On and Diagnostic Trouble Code 45 in PCM Memory (Install New PCM Calibration)

Models: | 1995 Saturns equipped with SOHC (L24) engines and automatic transaxles (MP6)

### Condition

The malfunction indicator lamp (MIL) (SERVICE ENGINE SOON telltale lamp) comes On after coasting down long grades with A/C Off, without throttle pedal input. The MIL will eventually go out. When performing diagnostics, a diagnostic trouble code (DTC) 45 will be stored in PCM memory.

### Cause

The PCM calibration fails to recognoze gear changes during some down hill grade changes.

### Correction

Refer to the following procedures to verify the reason for the MIL to come On and the PCM to store DTC 45 is due to the condition stated above.

### Procedure

1. Verify that no other DTCs are stored in PCM memory

• | If other DTCs are stored in PCM memory, diagnose and repair according to diagnostic procedures in the "1995 Electronic Engine Controls Service Manual." After diagnosing and repairing other DTCs, proceed to next step of this bulletin and download new calibration.

• | If no other DTCs are stored in PCM memory, proceed to next step.

2. Install new PCM/EC calibration according to the calibration chart below. (Refer to "Reprogramming EEPROM" in the "Service Stall System User Guide.")

Important: Version 37.0 or greater service stall system (SSS) software is required for this flash process. Verify the SSS is version 37.0 greater.

3. Test drive vehicle and verify that DTC 45 does not reset in PCM memory. If DTC 45 does reset, refer to the "1995 Electronic Engine Controls Service Manual" for DTC 45 diagnosis.

### Claim Information

To receive credit for this repair during the warranty coverage period, submit a claim through the Saturn Dealer System as follows:

Case Type | Description | Labor Operation Code | Time
--- | --- | --- | ---
VW | Install New PCM Calibration | T9731 | 0.3 hrs

CALIBRATIONS
EEPROM I.D. | EEPROM I.D. | DESCRIPTION | SERVICE PCM PART # | PC/TC EEPROM I.D. PAIRS
3832 | 7717 | CODE 45 02 - FEDERAL | 21021306 | 8488
3810 | 7717 | CODE 45 O2 - CALIFORNIA | 21021306 | 8488