Reading Trouble Codes
The ECM stores component failure information under a related trouble code which can be recalled for diagnosis and repair. Read trouble codes by counting Malfunction Indicator Light (MIL) flashes or with diagnostic scan tester connected to the Data Link Connector (DLC). The tester is faster, and capable of reading information which would require testing individual ECM and sensor/solenoid connector terminals with a digital voltmeter. See SCAN TESTER DATA and SCAN TESTER USAGE .
If scan tester is not available, MIL flashes can be read by grounding DLC terminal with ignition on and engine off. For example, FLASH, FLASH, pause, FLASH, longer pause, indicates Code 21. The first series of flashes are the first digit of trouble code. The second series of flashes are the second digit of trouble code. Trouble codes are displayed starting with the lowest code. Each code is displayed 3 times and will continue as long as DLC is grounded.
| Code | Probable Cause | ||
|---|---|---|---|
| P0101 | Mass Airflow Sensor Circuit (3.8L) | ||
| P0112 | Intake Air Temp. Sensor Ckt (3.8L) (Low Temp. Indicated) | ||
| P0113 | Intake Air Temp. Sensor Ckt (3.8L) (High Temp. Indicated) | ||
| P0117 | Coolant Circuit Low Temperature (3.8L) | ||
| P0118 | Coolant Circuit High Temperature (3.8L) | ||
| P0122 | TP Sensor Circuit Signal Voltage Low | ||
| P0123 | TP Sensor Circuit Signal Voltage High | ||
| P0131 | HO2S Circuit Low Signal Voltage | ||
| P0132 | HO2S Circuit High Signal Voltage | ||
| P0134 | HO2S Circuit Open (3.8L) | ||
| P0171 | Fuel Trim Lean (Lean Exhaust) | ||
| P0172 | Fuel Trim Rich (Rich Exhaust) | ||
| P0321 | Spark Reference Circuit | ||
| P0325 | Knock Sensor Circuit (3.8L) | ||
| P0327 | Knock Sensor Circuit Grounded (4.3L) | ||
| P0328 | Knock Sensor Circuit Open (4.3L) | ||
| P0341 | Cam/Crank Error (3.8L) | ||
| P0342 | Cam Signal Circuit | ||
| P0400 | EGR Error | ||
| P0401 | EGR Flow Test Error (3.8L) | ||
| P0501 | VSS Circuit (3.8L) | ||
| P0502 | VSS Circuit (3.8L) | ||
| P0703 (1) | TCC Brake Input Circuit (3.8L) | ||
| P0705 (1) | Transaxle Range Switch Circuit (3.8L) | ||
| P0712 (1) | Transaxle Temp. Sensor (3.8L) (Low Temp. Indicated) | ||
| P0713 (1) | Transaxle Temp. Sensor (3.8L) (High Temp. Indicated) | ||
| P0740 (1) | TCC Problem (3.8L) | ||
| P0755 (1) | Transaxle Shift "B" Solenoid Problem (3.8L) | ||
| P1222 | Fuel Pump Voltage Low | ||
| P1350 | Ignition Control Circuit (3.8L) | ||
| P1361 | Ignition Control Circuit (3.8L) | ||
| P1406 | EGR Pintle Position Error (3.8L) | ||
| P1530 | A/C Head Pressure Switch Circuit | ||
| P1531 | Low A/C Refrigerant Charge | ||
| P1558 | Cruise System Problem | ||
| P1561 | Cruise Vent Solenoid Circuit | ||
| P1562 | Cruise Vacuum Solenoid Circuit | ||
| P1565 | Cruise Servo Position Sensor Circuit | ||
| P1567 | Cruise Switches Circuit | ||
| P1568 | Cruise System Problem | ||
| P1571 (1) | Traction Control Torque Out Of Range | ||
| P1573 (1) | Traction Control Fault (Loss Of ABS/TCS Serial Data) | ||
| P1599 | Cruise Power Management | ||
| P1623 | PROM Error | ||
| P1630 | System Voltage High/Low (3.8L) | ||
| P1640 | Quad-Driver No. 1 Circuit (3.8L) | ||
| P1650 | Quad-Driver No. 2 Circuit (3.8L) | ||
| P1670 | Quad-Driver No. 4 Circuit (3.8L) | ||
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