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Test DTC - Checking System For Diagnostic Trouble Codes

NOTE: Ensure battery is fully charged before proceeding with test.
  1. Attempt to start engine. Crank engine for up to 10 seconds (if necessary). Diagnostic Trouble Codes (DTCs) may be retrieved using scan tool or Malfunction Indicator Light (MIL) on instrument panel.
  2. If using MIL on instrument panel to check for DTCs, see RETRIEVING DIAGNOSTIC TROUBLE CODES  for proper procedure. Read DTC code flashed by the MIL.
  3. If using scan tool to check for DTCs, connect scan tool to Data Link Connector (DLC). For Data Link Connector (DLC) location, See Figure. Using scan tool manufacturer's instructions, read DTC message and code.
  4. If scan tool displays NO RESPONSE, go to TEST NS-6A. If scan tool will not power up, check for loose cable connections or bad cable. If cable connections and cable are okay, check voltage at cavity No. 16 (Pink wire) on DLC. Voltage should be at least 11 volts. If voltage is not as specified, check wiring circuit and necessary fuses. See the WIRING DIAGRAMS article.
  5. If scan tool displays an error message, (i.e. USER-REQUESTED COLD BOOT or USER-REQUESTED WARM BOOT), follow scan tool instructions. If scan tool displays a BUS failure (i.e. SHORT TO BATTERY), this indicates either scan tool failure or BUS failure. To diagnose and correct BUS failures, see VEHICLE COMMUNICATIONS article in the ACCESSORIES/SAFETY EQUIPMENT section.
  6. If DTCs are displayed, see DTC MESSAGES & CODES  table and perform appropriate test(s). If no DTCs are displayed, refer to one of the following:
    • For Driveability problems, perform TEST NTC-1A.
    • For No-Start problems, perform TEST NS-1A.
    • For Speed (Cruise) Control problems, perform TEST TC-15A. Also see the CRUISE CONTROL SYSTEMS article in the ACCESSORIES/SAFETY EQUIPMENT section.
    • For Charging system problems, perform TEST TC-5A. Also See the GENERATORS & REGULATORS article in ELECTRICAL section.
NOTE: Some Diagnostic Trouble Codes (DTCs) have more than one meaning. Malfunction Indicator Light (MIL) is unable to distinguish between different failures. As an example, there are 4 different failures possible for the oxygen sensor (O2S) system, MIL can only identify an O2S failure by flashing a DTC 21. MIL is capable of displaying all possible system failures.
NOTE: A scan tool may not be able to identify all possible Diagnostic Trouble Codes (DTCs). As an example, a scan tool may not be able to identify or display a DTC for a malfunctioning A/C clutch relay circuit. There are 21 DTCs which a scan tool cannot identify. The Malfunction Indicator Light (MIL) must be used to identify these malfunctions.
DTC MESSAGES & CODES

Scan Tool Message SAE Code MIL Code Test No.
5-VOLT SUPPLY OUTPUT TOO LOW P1496 71 TEST TC-146A 
A/C CLUTCH RELAY CIRCUIT N/A 33 TEST TC-16A 
A/C PRESSURE SENSOR VOLTS TOO HIGH N/A 33 TEST TC-90A 
A/C PRESSURE SENSOR VOLTS TOO LOW N/A 33 TEST TC-91A 
AUTO SHUTDOWN RELAY CONTROL CIRCUIT N/A 42 TEST TC-10A 
BRAKE SWITCH SENSE CIRCUIT P0703 65 TEST TC-152A 
CATALYTIC CONVERTER EFFICIENCY FAILURE P0420 (1)64 TEST TC-112A 
CHARGING SYSTEM VOLTAGE TOO HIGH N/A 46 TEST TC-6A 
CHARGING SYSTEM VOLTAGE TOO LOW N/A 47 TEST TC-5A 
CLOSED LOOP TEMPERATURE NOT REACHED P0125 17 TEST TC-128A 
CYLINDER #1 MISFIRE P0301 43 TEST TC-107A 
CYLINDER #2 MISFIRE P0302 43 TEST TC-107A 
CYLINDER #3 MISFIRE P0303 43 TEST TC-107A 
CYLINDER #4 MISFIRE P0304 43 TEST TC-107A 
CYLINDER #5 MISFIRE P0305 43 TEST TC-107A 
CYLINDER #6 MISFIRE P0306 43 TEST TC-107A 
DOWNSTREAM O2 SENSOR HEATER FAILURE P0141 21 TEST TC-105A 
DOWNSTREAM O2 SENSOR SHORTED TO VOLTAGE P0138 21 TEST TC-126A 
DOWNSTREAM O2 SENSOR STAYS AT CENTER P0140 21 TEST TC-129A 
DOWNSTREAM O2S VOLTAGE SHORTED TO GROUND P0137 21 TEST TC-156A 
EATX CONTROLLER DTC PRESENT P0700 45 (2)
ECT SENSOR VOLTAGE TOO HIGH P0118 22 TEST TC-31A - ECT SENSOR VOLTAGE TOO HIGH 
ECT SENSOR VOLTAGE TOO LOW P0117 22 TEST TC-30A 
EGR SOLENOID CIRCUIT P0403 32 TEST TC-17A 
EGR SYSTEM FAILURE P0401 32 TEST TC-46A 
ENGINE IS COLD TOO LONG N/A 17 (3)
EVAP PURGE FLOW MONITOR FAILURE P0441 31 TEST TC-113A 
EVAP PURGE SOLENOID CIRCUIT P0443 31 TEST TC-18A 
FUEL LEVEL SENDING UNIT VOLTS TOO HIGH N/A 42 (4)
FUEL LEVEL SENDING UNIT VOLTS TOO LOW N/A 42 (4)
FUEL LEVEL SENDING UNIT NO CHANGE OVER MILES N/A 42 (4)
FUEL PUMP RELAY CONTROL CIRCUIT N/A 42 TEST TC-101A 
FUEL SYSTEM LEAN P0171 51 TEST TC-119A 
FUEL SYSTEM RICH P0172 52 TEST TC-118A 
GENERATOR FIELD NOT SWITCHING PROPERLY N/A 41 TEST TC-11A 
HI SPEED RAD FAN CTRL RELAY CIRCUIT P1487 35 TEST TC-139A 
HIGH SPEED FAN CTRL RELAY CIRCUIT P1489 35 TEST TC-93A 
IDLE AIR CONTROL MOTOR CIRCUITS P0505 25 TEST TC-25A 
IGNITION COIL #1 PRIMARY CIRCUIT P0351 43 TEST TC-43A 
IGNITION COIL #2 PRIMARY CIRCUIT P0352 43 TEST TC-42A 
IGNITION COIL #3 PRIMARY CIRCUIT P0353 43 TEST TC-41A 
INJECTOR #1 CONTROL CIRCUIT P0201 27 TEST TC-21A 
INJECTOR #2 CONTROL CIRCUIT P0202 27 TEST TC-21A 
INJECTOR #3 CONTROL CIRCUIT P0203 27 TEST TC-21A 
INJECTOR #4 CONTROL CIRCUIT P0204 27 TEST TC-21A 
INJECTOR #5 CONTROL CIRCUIT P0205 27 TEST TC-21A 
INJECTOR #6 CONTROL CIRCUIT P0206 27 TEST TC-21A 
INTAKE AIR TEMP SENSOR VOLTAGE HIGH P0113 23 TEST TC-58A 
INTAKE AIR TEMP SENSOR VOLTAGE LOW P0112 23 TEST TC-57A 
INTERMITTENT LOSS OF CMP OR CKP P1391 11 TEST TC-157A 
INTERNAL CONTROLLER FAILURE P0601 53 (5)
KNOCK SENSOR #2 CIRCUIT N/A 16 TEST TC-83A 
KNOCK SENSOR CIRCUIT N/A 16 TEST TC-59B 
LEAK DETECTION PUMP SWITCH OR MECHANICAL FAULT P1494 31 TEST TC-184A 
LEAK DETECTION PUMP SOLENOID CIRCUIT P1495 31 TEST TC-183A 
LEFT BANK CATALYTIC CONVERTER EFFICIENCY FAILURE P0420 (1)64 TEST TC-112A 
LEFT BANK UPSTREAM O2S VOLTAGE SHORTED TO GROUND P0131 21 TEST TC-155A 
LEFT DOWNSTREAM O2 SENSOR HEATER FAILURE P0141 21 TEST TC-105A 
LEFT DOWNSTREAM O2 SENSOR STAYS AT CENTER P0140 21 TEST TC-129A 
LEFT DOWNSTREAM O2S VOLTS SHORTED TO GROUND P0137 21 TEST TC-156A 
LEFT UPSTREAM O2S SENSOR SHORTED TO VOLTAGE P0132 21 TEST TC-62A 
LEFT O2S SENSOR STAYS AT CENTER P0134 21 TEST TC-32A 
LEFT UPSTREAM O2 SENSOR HEATER FAILURE P0135 21 TEST TC-103A 
LEFT UPSTREAM O2 SENSOR SLOW RESPONSE P0133 21 TEST TC-102A 
LOW SPEED FAN CTRL RELAY CIRCUIT P1490 35 TEST TC-92A - LOW SPEED FAN CONTROL RELAY CIRCUIT 
MANIFOLD TUNE VALVE SOLENOID CIRCUIT P1289 65 TEST TC-88A 
MAP SENSOR VOLTAGE TOO HIGH P0108 14 TEST TC-37A 
MAP SENSOR VOLTAGE TOO LOW P0107 14 TEST TC-36A 
MIS-FIRE ADAPTIVE NUMERATOR AT LIMIT P1398 11 TEST TC-186A 
MULTIPLE CYLINDER MISFIRE P0300 43 TEST TC-106A 
NO 5 VOLTS TO MAP SENSOR P1296 14 TEST TC-135A 
NO ASD RELAY OUTPUT VOLTAGE AT PCM N/A 42 TEST TC-44A 
NO CAM SIGNAL AT PCM P0340 54 TEST TC-1A 
NO CCD MESSAGE FROM CONTROL MODULE N/A 66 TEST TC-97A 
NO CCD MESSAGES FROM TCM P1698 66 TEST TC-96A 
NO CHANGE IN MAP FROM START TO RUN P1297 13 TEST TC-39A 
NO CRANK REFERENCE SIGNAL AT PCM N/A 11 TEST TC-40A 
NO VEHICLE SPEED SENSOR SIGNAL P0500 15 TEST TC-35A 
O2 SENSOR STAYS AT CENTER P0134 21 TEST TC-32A 
P/N SWITCH STUCK IN PARK OR IN GEAR P1899 37 TEST TC-114A 
PCM FAILURE SPI COMMUNICATIONS P0600 53 (5)
RIGHT BANK CATALYST EFFICIENCY FAILURE P0432 72 TEST TC-180A 
RIGHT BANK DWNSTR O2S SHORTED TO GROUND P0157 21 TEST TC-182A 
RIGHT BANK FUEL SYSTEM LEAN P0174 51 TEST TC-121A 
RIGHT BANK FUEL SYSTEM RICH P0175 52 TEST TC-120A 
RIGHT BANK UPSTRM O2S SHORTED TO GROUND P0151 21 TEST TC-181A 
RIGHT DOWNSTREAM O2S HEATER FAILURE P0161 21 TEST TC-125A 
RIGHT DOWNSTREAM O2S SHORTED TO VOLTAGE P0158 21 TEST TC-127A 
RIGHT DOWNSTREAM O2S STAYS AT CENTER P0160 21 TEST TC-130A 
RIGHT O2S SENSOR SHORTED TO VOLTAGE P0152 21 TEST TC-66A 
RIGHT O2S STAYS AT CENTER P0154 21 TEST TC-65A 
RIGHT UPSTREAM O2 SENSOR HEATER FAILURE P0155 21 TEST TC-124A 
RIGHT UPSTREAM O2 SENSOR SLOW RESPONSE P0153 21 TEST TC-122A 
SPEED CONTROL POWER RELAY CIRCUIT N/A 77 TEST TC-15A 
SPEED CONTROL SOLENOID CIRCUITS N/A 34 TEST TC-15A 
SPEED CONTROL SWITCH ALWAYS HIGH N/A 34 TEST TC-86A 
SPEED CONTROL SWITCH ALWAYS LOW N/A 34 TEST TC-87A 
TARGET IDLE NOT REACHED P1294 25 TEST TC-138A 
THROTTLE POSITION SENSOR VOLTAGE HIGH P0123 24 TEST TC-27A 
THROTTLE POSITION SENSOR VOLTAGE LOW P0122 24 TEST TC-26A 
TIMING BELT SKIPPED 1 TOOTH OR MORE P1390 11 TEST TC-133A 
TPS VOLTAGE DOES NOT AGREE WITH MAP P0121 24 TEST TC-132A 
UPSTREAM O2S VOLTAGE SHORTED TO GROUND P0131 21 TEST TC-155A 
UPSTREAM O2 SENSOR HEATER FAILURE P0135 21 TEST TC-103A 
UPSTREAM O2 SENSOR SHORTED TO VOLTAGE P0132 21 TEST TC-62A 
UPSTREAM O2 SENSOR SLOW RESPONSE P0133 21 TEST TC-102A 
VACUUM LEAK FOUND (IAC FULLY SEATED) P1299 25 TEST TC-145A 
UPSTREAM O2S VOLTAGE SHORTED TO GROUND P0131 21 TEST TC-155A 
(1) MIL may also displayCode 72 in addition to Code 64.

(2) Refer to appropriate TRANSAXLE article for diagnosis of electronic controlled transaxle.

(3) Check cooling systemand thermostat if engine coolant temp does not reach 176°F (80°C) after driving 20 minutes.

(4) Refer to BODY CONTROL COMPUTER TESTS article in the ACCESSORIES/SAFETY EQUIPMENT section for fuellevel sending unit testing.

(5) Replace Powertrain Control Module (PCM). Perform TEST VER-2A - ROAD TEST VERIFICATION .
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