Test TC-1A - Checking System For Trouble Codes

NOTE: For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION. For wiring diagrams, see WIRING DIAGRAMS - 3.0L article in ENGINE PERFORMANCE.

NOTE: Battery must be fully charged before proceeding.

Battery must be fully charged before proceeding. Attempt to start engine. If engine will not start, crank engine for at least 10 seconds. Connect scan tool to engine diagnostic connector. Record scan tool trouble codes.
If scan tool has a blank screen or displays an error message, this indicates a scan tool failure. To diagnose and correct these conditions, see TESTS W/CODES - BODY CONTROL COMPUTER article (AA Body), TESTS W/CODES - BODY CONTROL COMPUTER article (LH Body), or TESTS W/CODES - BODY CONTROL COMPUTER article (AJ Body), in this section.
If scan tool displays NO RESPONSE, go to TEST NS-6A . If trouble codes are displayed, see TROUBLE CODES table. If no trouble codes are displayed and a driveability problem is present, go to TEST NTC-1A . If no trouble codes are displayed and a no-start problem is present, go to TEST NS-1A .

TROUBLE CODES

MIL Code ⁽¹⁾

Scan Tool Message

Test No.

Code 11

NO CRANK REFERENCE SIGNAL AT PCM

TEST TC-2A

Code 54

NO CAM SIGNAL AT PCM

TEST TC-3A

Code 13

NO CHANGE IN MAP FROM START TO RUN

TEST TC-4A

Code 14

MAP SENSOR VOLTAGE TOO LOW

TEST TC-5A

Code 14

MAP SENSOR VOLTAGE TOO HIGH

TEST TC-6A

Code 15

NO VEHICLE SPEED SENSOR SIGNAL

TEST TC-7A

Code 21

O2S STAYS AT CENTER

TEST TC-8A

Code 52

O2S STAYS ABOVE CENTER (RICH)

TEST TC-9A

Code 51

O2S STAYS BELOW CENTER (LEAN)

TEST TC-10A

Code 21

O2S SHORTED TO VOLTAGE

TEST TC-11A

Code 22

ECT SENSOR VOLTAGE TOO LOW

TEST TC-12A

Code 22

ECT SENSOR VOLTAGE TOO HIGH

TEST TC-13A

Code 24

THROTTLE POSITION SENSOR VOLTAGE LOW

TEST TC-14A

Code 24

THROTTLE POSITION SENSOR VOLTAGE HIGH

TEST TC-15A

Code 25

IDLE AIR CONTROL MOTOR CIRCUITS

TEST TC-16A

Code 27

INJECTOR CONTROL CIRCUIT

TEST TC-17A

Code 62

PCM FAILURE SRI MILE NOT STORED

TEST TC-23A

Code 63

PCM FAILURE EEPROM WRITE DENIED

TEST TC-23A

Code 32

EGR SYSTEM FAILURE

TEST TC-24A

Code 32

EGR SOLENOID CIRCUIT

TEST TC-25A

Code 31

EVAP SOLENOID CIRCUIT

TEST TC-26A

Code 37

TORQUE CONVERTER CLUTCH SOLENOID CIRCUIT

TEST TC-27A

Code 42

NO ASD RELAY OUTPUT VOLTAGE AT PCM

TEST TC-28A

Code 42

AUTO SHUTDOWN RELAY CONTROL CIRCUIT

TEST TC-29A

Code 33

A/C CLUTCH RELAY CIRCUIT

TEST TC-30A

Code 35

RADIATOR FAN RELAY CIRCUIT

TEST TC-31A

Code 35

LOW SPEED FAN CTRL RELAY CIRCUIT**

TEST TC-32A

Code 35

HIGH SPEED FAN CTRL RELAY CIRCUIT**

TEST TC-33A

Code 44

BATTERY TEMP SENSOR VOLTS OUT OF LIMIT

TEST TC-38A

Code 12⁽²⁾

BATTERY DISCONNECT

Code 55⁽³⁾

Code 17

ENGINE IS COLD TOO LONG

⁽⁴⁾

Code 53

INTERNAL PCM FAILURE

⁽⁵⁾

Code 41

GENERATOR FIELD NOT SWITCHING PROPERLY

⁽⁶⁾

Code 47

CHARGING SYSTEM VOLTAGE TOO LOW

⁽⁶⁾

Code 46

CHARGING SYSTEM VOLTAGE TOO HIGH

⁽⁶⁾

Code 34

SPEED CONTROL SOLENOID CIRCUITS

⁽⁷⁾

Code 53

PCM FAILURE SPI COMMUNICATIONS

⁽⁵⁾

⁽¹⁾	- Malfunction Indicator Light (MIL) (Check Engine) light.

⁽²⁾	- Battery input to PCM was disconnected within the last 50 key-on cycles.

⁽³⁾	- Completion of trouble code display.

⁽⁴⁾	- If engine temperature does not reach 176°F (80°C) after 20 minutes of driving, check cooling system. This code may also set in error during very cold slow speed driving.

⁽⁵⁾	- Replace Powertrain Control Module (PCM) and perform TEST VER-2.

⁽⁶⁾	- Refer to appropriate ALTERNATORS & REGULATORS article in STARTING & CHARGING SYSTEMS.

⁽⁷⁾	- Refer to appropriate CRUISE CONTROL SYSTEMS article in ACCESSORIES & EQUIPMENT.