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 test procedure.

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

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

If the message is "NO FAULTS":

1. Start the engine and allow the engine to reach normal operating temperature.
2. 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.
3. For A/C equipped vehicles, turn on the A/C and set the blower motor on low speed. If the vehicle stalls with the A/C on:
a. Turn the ignition switch OFF and disconnect the engine controller connector.
b. Inspect the connector for damage, repairing as necessary.
c. Turn the ignition key on, put the scan tool in voltmeter mode, and check the engine controller connector DB wire at cavity 9.
d. If the reading is less than 10 volts, repair the open in the circuit. If the reading is more than 10 volts, replace the engine controller.
e. Perform VERIFICATION TEST 2.
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 any fault codes with the scan tool.

If the scan tool still reads "NO FAULTS", 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 DR-30.

If the scan tool message is "INTERNAL CONTROLLER FAILURE":

1. Replace the engine controller.
2. Perform VERIFICATION TEST 2.

If the scan tool message is "ENGINE COLD TOO LONG":

1. Perform the necessary repairs to bring the cooling system into specifications.
2. Perform VERIFICATION TEST 3.




FAULT CODES AND RELATED TESTS

SCAN TOOL MESSAGE HARD INTERMITTENT
FAULT FAULT

Slow change in idle map signal DR-2A DR-44A
No change in MAP from START to RUN DR-3A DR-44A
MAP voltage too low DR-4A DR-44A
MAP voltage too high DR-5A DR-44A
No vehicle speed signal DR-6A DR-6A
Oxygen sensor signal stays at center DR-7A DR-7A
Oxygen sensor signal shorted to voltage DR-8A DR-8A
Coolant sensor voltage high DR-9A DR-44A
Coolant sensor voltage low DR-10A DR-44A
Throttle Position Sensor voltage high DR-11A DR-44A
Throttle Position Sensor voltage low DR-12A DR-44A
Automatic Idle Speed motor circuits DR-13A DR-45A
Injector #1 control circuit DR-14A DR-46A
Injector #2 control circuit DR-15A DR-46A
Injector #3 control circuit DR-16A DR-46A
Injector #4 control circuit DR-17A DR-46A
Purge solenoid circuit DR-18A DR-43A
EGR solenoid circuit DR-19A DR-43A
EGR system failure DR-20A DR-20A
A/C clutch relay circuit DR-22A DR-43A
Radiator fan relay circuit DR-24A DR-43A
Wastegate solenoid circuit DR-25A DR-43A
No ASD relay voltage sense at controller DR-26A DR-26A
Turbo Boost limit exceeded DR-27A DR-27A
Barometric read solenoid circuit DR-28A DR-43A
Controller failure EEPROM write denied DR-29A DR-29A
Oxygen sensor signal stays below center DR-30A DR-30A
Oxygen sensor signal stays above center DR-30A DR-30A