DR-1A CODE to DR TEST Chart (Checking for Fault Codes)

Note: The battery must be fully charged and at rated capacity before performing any Driveability (DR) or No Fault (NF) test procedure.

If the vehicle starts and stalls repeatedly, perform test NS-2A.

If the vehicle stalls with the A/C on, perform test NF-9A, if not proceed to STEP 1.


1. Connect the scan tool to the underhood diagnostic connector and read fault codes. Refer to Powertrain Management/Computers and Control Systems/Testing and Inspection/Procedures.

- If there are fault codes present go to step 7.
- If the message is "NO FAULTS" go to step 2.

2. Start the engine and allow the engine to reach normal operating temperature.

3. Run the engine at 2000 rpm for at least 10 seconds, then return to idle speed.
Note: Set the speed manually, not with the scan tool.

4. For automatic transmission equipped vehicles, apply the brakes (parking and service) and shift through all the gears, returning to PARK when finished,

5. Read fault codes with the scan tool.

- If there are fault codes present go to step 7.
- If the message is "NO FAULTS" go to step 6.

76. Check for applicable Technical Service Bulletins and Manual Updates. If an applicable Technical Service Bulletin is found, follow the repair procedures outlined in the bulletin. If driveability problems continue to occur after repairs are done, or there are no applicable bulletins, perform test NF-1A.

7. If the scan tool message is "INTERNAL CONTROLLER FAILURE" or "CONTROLLER FAILURE":

a. Replace the PCM.
b. Perform VERIFICATION TEST 2.

9. If the scan tool message is "Engine COLD TOO LONG", if not go to "Fault Codes And Related Tests":

a. Perform the necessary repairs to bring the cooling system into specifications.
b. Perform VERIFICATION TEST 3.

Fault Codes And Related Tests

SCAN TOOL MESSAGE HARD FAULT INTERMITTENT
FAULT

Slow Change In Idle Map Signal DR-2A DR-32B
No Change In MAP From START To RUN DR-3A DR-32B
MAP Voltage Too Low DR-4A DR-32A
MAP Voltage Too High DR-5A DR-32A
No Vehicle Speed Signal DR-6A DR-6A
O2 Sensor Signal Stays At Center DR-7A DR-32A
O2 Sensor Signal Shorted To Voltage DR-8A DR-32A
O2 Sensor Signal Stays Above Center DR-9A DR-32A
O2 Sensor Signal Stays Below Center DR-10A DR-32A
Coolant Sensor Voltage High DR-11A DR-32A
Coolant Sensor Voltage Low DR-12A DR-32A
Throttle Position Sensor Voltage High DR-15A DR-32A
Throttle Position Sensor Voltage Low DR-16A DR-32A
Automatic Idle Speed Motor Circuits DR-17A DR-33A
Purge Solenoid Circuit DR-18A DR-34A
EGR Solenoid Circuit DR-19A DR-34A
EGR System Failure DR-20A DR-34A
A/C Clutch Relay Circuit DR-25A DR-34A
Rad. Fan Relay Circuit DR-26A DR-34A
No ASD Voltage Sense At Controller DR-27A DR-34A
Torque Converter Lockup Solenoid CKT DR-28A DR-34A
Injector #1 Control Circuit DR-30A DR-30A
Controller Failure EMR Miles Not Stored DR-31A DR-31A
Controller Failure EEPROM Write Denied DR-31A DR-31A