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Engine Controls Self-Diagnostics - 3.4L: Other Pontiac Montana I

Testing & Diagnostics ~8137 words

Code Types

There are 4 types of DTC categories

  1. Type "A" Emissions related. Illuminates MIL the first time DTC sets.
  2. Type "B" Emissions related. Illuminates MIL if fault is active for 2 consecutive driving cycles.
  3. Type "C" Non-emissions related. Does not illuminate MIL, but will illuminate SERVICE light.
  4. Type "D" Non-emissions related. Does not illuminate MIL or SERVICE light.

Freeze Frame/Failure Records

PCM stores one FREEZE FRAME record for the first failed test that sets a DTC and illuminates MIL. FREEZE FRAME will not be overwritten unless a misfire or fuel trim DTC is set.

Failure records are stored when any DTC is set. Some PCMs can store up to 5 failure records. Failure records will be stored for all types of codes, whether or not MIL is illuminated.

Typical data includes

  1. Air/fuel ratio.
  2. Airflow rate.
  3. Fuel trim.
  4. Engine speed.
  5. Engine load.
  6. Engine coolant temperature.
  7. Vehicle speed.
  8. Throttle position angle.
  9. Manifold absolute pressure.
  10. Injector base pulse width.
  11. Loop status.

Monitors

  1. Comprehensive Component Monitor Monitors PCM systems for opens, shorts, grounded and out-of-range sensors. Also monitors rationality of sensors. Rationality is whether the sensor's value is consistent with operating conditions of the other sensors.
  2. Misfire Monitor Monitors engine misfire using crankshaft sensor to determine location and severity of misfire. A catalyst damaging misfire will flash the MIL, and a non-catalyst damaging misfire is a normal Type "B" code.
  3. Fuel Trim Monitor Monitors short and long term fuel trim for being at maximum lean or rich limit.
  4. Oxygen Sensor Monitor Monitors all oxygen sensors for maximum voltage level, minimum voltage level and lean rich/rich lean switching rate.
  5. Oxygen Sensor Heater Monitor Monitors oxygen sensor heater by watching sensor's time-to-activity after a cold start.
  6. Catalyst Monitor Monitors catalyst efficiency by comparing activity rate of pre-catalyst oxygen sensor and post-catalyst oxygen sensor.
  7. EVAP Monitor Monitors EVAP system for large leaks, small leaks and purge flow.

Disconnect Battery

Note. On many OBD-II systems, PCM will retain memory for an extended period of time with battery disconnected. Memory may be retained for several days.

Disconnecting PCM power or battery ground will clear all PCM memory including DTCs, FREEZE FRAME, failure records, adaptive learning and system monitors.

Warm-up Cycles

If fault that caused DTC to set is repaired, PCM will begin to count warm-up cycles. After 40 consecutive warm-up cycles with no further faults, PCM will automatically clear DTC from memory.

POWERTRAIN CONTROL MODULE

After replacing PCM or if program needs to be updated, refer to latest Techline(R) information on PCM reprogramming. After reprogramming, perform CRANKSHAFT POSITION SENSOR SYSTEM VARIATION LEARN PROCEDURE and PROGRAMMING THEFT DETERRENT SYSTEM COMPONENTS .

CRANKSHAFT POSITION SENSOR SYSTEM VARIATION LEARN PROCEDURE

CAUTIONBefore performing Crankshaft Position Sensor (CKP) system variation learn procedure, always set parking brake and block drive wheels in order to prevent personal injury. Ensure hood is closed. Release throttle immediately when engine starts to decelerate in order to eliminate over-revving engine. Once learn procedure has been completed, control module will return engine control to operator and engine will respond to throttle position.

Note. Battery must be fully charged and in good condition. Scan tool connection at DLC should be clean and tight before starting CKP system variation learn procedure.

  1. Turn ignition off.
  2. Ensure hood is closed.
  3. Ensure engine is at normal operating temperature.
  4. Turn ignition off.
  5. Using scan tool, select and enable CKP Variation Learn Procedure.
  6. Set parking brake when instructed by scan tool.
  7. Start engine.
  8. Apply and hold service brake pedal firmly.
  9. Ensure transmission is in Park or Neutral.
  10. Steadily depress accelerator pedal until fuel cut-off is reached at 5150 RPM and hold. Release accelerator pedal after the second fuel cut-off has been reached.
  11. CKP system variation compensating values are learned when RPM decreases back to idle.
  12. Observe DTC status for DTC P1336.
  13. If scan tool indicates that DTC P1336 ran and passed, CKP system learn procedure is complete. If scan tool indicates that DTC P1336 failed, determine if other DTCs have set. If DTC other than P1336 is not set, repeat CKP learn procedure as necessary.

PROGRAMMING THEFT DETERRENT SYSTEM COMPONENTS

If replacing a PCM with a replacement part, after programming, these modules will learn incoming fuel continue password immediately upon receipt of a password message. Once a password message is received and a password is learned, a learn procedure must be performed to change this password again. A PCM which has been previously installed in another vehicle will have learned the other vehicle's fuel continue password and will require a learn procedure after programming to learn current vehicle's password.

10-Minute Learn Procedure

Note. Ensure latest Techline(R) Service Programming System (SPS) software is used.

  1. Connect Tech 2 scan tool to DLC. Turn ignition on, with engine off. Ensure accessories are off.
  2. Using scan tool, select "Request Information" under Service Programming and follow on-screen instructions.
  3. Disconnect scan tool from vehicle and connect it to a Techline(R) terminal.
  4. Using Techline(R) terminal, select "Service Programming System" and follow on-screen instructions.
  5. Disconnect scan tool from Techline(R) terminal and connect scan tool to vehicle.
  6. Using PassKey III(R) master key, turn ignition on, with engine off.
  7. Using scan tool, select "Program ECU" under Service Programming System.
  8. Leave scan tool connected for the duration of the 10-minute relearn procedure.
  9. Observe scan tool. After about 10 minutes, "PROGRAMMING SUCCESSFUL, TURN OFF IGNITION" should be displayed. Vehicle is now ready to relearn key information and/or passwords on the next ignition switch transition from off to on.
  10. Turn ignition off and wait 5 minutes.
  11. Using PassKey III(R) master key, start engine. The theft deterrent control module has now learned the key transponder information and PCM has now learned the fuel continue password.

30-Minute Learn Procedure

Note. Ensure the latest Techline(R) Service Programming System (SPS) software is used.

  1. Using PassKey III(R) master key, turn ignition on, with engine off.
  2. Observe SECURITY indicator light for about 10 minutes. Indicator light should turn off.
  3. Turn ignition off and wait 5 seconds.
  4. Repeat steps 1 - 4 two more times for a total of 3 cycles or 30 minutes.
  5. Using PassKey III(R) master key, start vehicle. Vehicle has now learned the key transponder information and PCM has now learned the fuel continue password.
  6. Using scan tool, clear any DTCs.

DRIVE CYCLES

Note. See INSPECTION/MAINTENANCE SYSTEM CHECK .

Enable Criteria

Passive Test

  1. Engine coolant temperature is 39-221°F (4-105°C).
  2. Intake air temperature is 39-158°F (4-70°C).
  3. Battery voltage is greater than 10 volts.
  4. Active Test, if required, begins after engine goes into closed-loop fuel control.

Active Test

  1. Engine coolant temperature is 176-221°F (80-105°C).
  2. Intake air temperature is greater than 50°F (10°C).
  3. Engine operating in closed-loop fuel control.
  4. Battery voltage is greater than 10 volts.
  1. Barometric pressure is greater than 65 kPa.
  2. Engine coolant temperature is 203-212°F (95-100°C).
  3. Intake air temperature is 59-167°F (15-75°C).
  4. Engine in closed-loop fuel control.
  5. Engine has run for 6-8 minutes off idle in order to initiate test.
  6. Battery voltage is 10-18 volts.
  1. Barometric pressure is greater than 65 kPa.
  2. Engine coolant temperature is at 176-230°F (80-110°C).
  3. Intake temperature is less than 149°F (65°C).
  1. Barometric pressure is greater than 65 kPa.
  2. Engine coolant temperature is less than 158°F (70°C).
  3. Fuel level is 1/4-3/4 tank.
  4. Battery voltage is 9-16 volts.
  1. Engine coolant temperature is greater than 176°F (80°C).
  2. Engine in closed-loop.
  3. Engine running for more than 4 minutes.
  4. Battery voltage is 10-18 volts.
  1. Engine coolant temperature & intake air temperature are less than 90°F (32°C).
  2. Difference between engine coolant temperature and intake air temperature is less than 7°F (5°C).
  3. Battery voltage is 10-18 volts.

SUMMARY

If no Diagnostic Trouble Codes (DTCs) are present and a no start condition exists, proceed to appropriate BASIC DIAGNOSTIC PROCEDURES article. If no DTCs are present and a driveability condition exists, proceed to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, ENGINE STALLS, etc.).

MIL INOPERATIVE

Note. For circuit reference, see WIRING DIAGRAMS article.

  1. Perform powertrain diagnostic system check. See «POWERTRAIN DIAGNOSTIC SYSTEM CHECK»(ref-117480-S09475862442001082000000) under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check, go to next step.
  2. Check fuse that supplies voltage to MIL. If fuse is open, go to step 10 . If fuse is okay, go to next step.
  3. Turn ignition off. Disconnect PCM. Turn ignition on, with engine off. Connect fused jumper wire (3-amp) between MIL control circuit and ground. Observe MIL. If MIL illuminates, go to step 9 . If MIL does not illuminate, go to next step.
  4. Check fuse in jumper. If fuse is open, go to step 11 . If fuse is okay, go to next step.
  5. Remove Instrument Panel Cluster (IPC). Check MIL control circuit for open between PCM and IPC. Repair as necessary. After repairs, go to step 14 . If circuit is okay, go to next step.
  6. Using test light connected to ground, probe MIL ignition supply voltage circuit at IPC harness connector. If test light illuminates, go to step 8 . If test light does not illuminate, go to next step.
  7. Repair open in MIL ignition supply voltage circuit. After repairs, go to step 14 .
  8. Check IPC connector for poor connections. Repair as necessary. After repairs, go to step 14 . If connections are okay, go to step 12 .
  9. Check PCM connector for poor connections. Repair as necessary. After repairs, go to step 14 . If problem connections are okay, go to step 13 .
  10. Repair short to ground in MIL ignition supply voltage circuit. See WIRING DIAGRAMS article. After repairs, go to step 14 .
  11. Repair short to voltage in MIL control circuit. After repairs, go to step 14 .
  12. Replace IPC. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. After repairs, go to step 14 .
  13. Replace PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Perform PCM relearn procedure. See «POWERTRAIN CONTROL MODULE»(ref-117480-S27791892072001082000000) PROGRAMMING. After repairs, go to next step.
  14. Operate system to verify repair.

MIL ON STEADY

Note. For circuit reference, see WIRING DIAGRAMS article.

  1. Perform powertrain diagnostic system check. See «POWERTRAIN DIAGNOSTIC SYSTEM CHECK»(ref-117480-S09475862442001082000000) under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check, go to next step.
  2. Turn ignition on, with engine off. Observe MIL. If MIL turns off when ignition is turned on, go to step 5 . If MIL does not turn off when ignition is turned on, go to next step.
  3. Turn ignition off. Disconnect PCM harness connector. Turn ignition on, with engine off. Observe MIL. If MIL is illuminated, go to next step. If MIL is not illuminated, go to step 7 .
  4. Remove Instrument Panel Cluster (IPC). Check MIL control circuit for short to ground between PCM and IPC. Repair as necessary. After repairs, go to step 8 . If circuit is okay, go to next step.
  5. Repair MIL control circuit for short to voltage. After repairs, go to step 8 .
  6. Replace IPC. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. After repairs, go to step 8 .
  7. Replace PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Perform PCM relearn procedure. See «POWERTRAIN CONTROL MODULE»(ref-117480-S27791892072001082000000) under PROGRAMMING. After repairs, go to next step.
  8. Operate system to verify repair.

Code Enable Criteria

DTC will run when engine is running and DTC will set when PCM detects that oxygen sensor heater control circuit current is greater than the capacity of PCM internal driver, and condition is present for more than 20 seconds.

Conditions for running DTC

  1. DTCs P0102, P0103, P0107, P0108, P0121, P0122, P0123, P0401, P0404, P0405, P0440, P0442, P0446, P1404 or P1441 is not set.
  2. Engine is running.
  3. Ignition 1 signal is at least 9 volts and not greater than 18 volts.
  4. TP sensor angle is greater than 25 percent.
  5. TP sensor is steady for greater than 1.5 seconds.
  6. MAP sensor is greater than 63 kPa.
  7. MAP sensor is steady for greater than 3 seconds.

Conditions for setting DTC

  1. Actual MAF sensor signal is not within a predetermined range of the calculated MAF value.

Conditions for running DTC

  1. Engine is running.
  2. Idle air control valve position is greater than 2 counts.
  3. Ignition 1 signal is greater than 8 volts.
  4. Conditions present for greater than 0.5 second.

Conditions for setting DTC

  1. MAF sensor frequency signal is less than 1200 Hz.

Conditions for running DTC

  1. Engine is running.
  2. Idle air control valve position is greater than 2 counts.
  3. Ignition 1 signal is greater than 8 volts.
  4. Conditions are present for greater than 0.5 second.

Conditions for setting DTC

  1. MAF sensor frequency signal is greater than 11,500 Hertz.

Conditions for running DTC

  1. DTCs P0121, P0122 or P0123 is not set.
  2. Engine is running.
  3. Throttle angle is greater than zero percent, if engine speed is less than 1000 RPM.

Conditions for setting DTC

  1. MAP sensor signal voltage is less than 0.1 volt (12 kPa).
  2. Conditions are present for longer than 200 3X reference periods (67 crankshaft revolutions).

Conditions for running DTC

  1. DTCs P0121, P0122 or P0123 is not set.
  2. Engine has been running for a length of time that is determined by start-up coolant temperature. The length of time ranges from 2 minutes at less than 22°F (-6°C) to one second at greater than 86°F (30°C).
  3. Throttle angle is less than 2 percent when engine speed is less than 3000 RPM.
  4. Throttle angle is less than 30 percent when engine speed is greater than 3000 RPM.

Conditions for setting DTC

  1. MAP sensor signal voltage is greater than 4.3 volts for 3 seconds.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0117, P0118, P0125, P0128, P0502, P0503, P1114 or P1115 is not set.
  2. Engine has been running for more than 10 seconds.
  3. Vehicle speed is greater than 25 MPH.

Conditions for setting DTC

  1. IAT signal voltage indicates an intake air temperature that is greater than 275°F (135°C).
  2. Conditions are present for at least 20 seconds.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0117, P0118, P0125, P0128, P0502, P0503, P1114 or P1115 is not set.
  2. Vehicle speed is less than 35 MPH.
  3. Mass airflow is less than 12 grams/second.
  4. Engine coolant temperature is greater than 140°F (60°C).
  5. Engine run time is greater than 3 minutes.

Conditions for setting DTC

  1. IAT signal voltage indicates an intake air temperature that is less than -35°F (-37°C).
  2. Conditions are present for at least 20 seconds.

Conditions for running DTC

  1. Ignition is on.
  2. DTCs P0112, P0113, P0117, P0118, P0125, P0128, P0601, P0602, P1621 or P1683 is not set.
  3. Vehicle has a minimum soak time of 8 hours.

Conditions for setting DTC

  1. If PCM detects a temperature difference of greater than 27°F (15°C) between ECT and IAT, vehicle must be driven for 5 minutes at speed greater than 15 MPH. If IAT decreases greater than 12.6°F (7°C) then a block heater is indicated and test is aborted. If IAT temperature does not decrease, a block heater was not detected and DTC will set.
  2. Temperature difference ECT and IAT at start-up is greater than 252°F (140°C).
  3. Time spent cranking engine, without starting, is greater than 10 seconds.

DTC will run when engine is running and DTC will set when ECT sensor indicates an engine coolant temperature greater than 283°F (140°C) for more than 15 seconds.

DTC will run when engine is running and DTC will set when ECT sensor indicates an engine coolant temperature is less than -36°F (-38°C) for more than 15 seconds.

Conditions for running DTC

  1. DTCs P0107, P0108, P0122, P0123, P1106, P1107, P1121 or P1122 is not set.
  2. Engine is running for more than 2 minutes.
  3. Engine coolant temperature is greater than 167°F (75°C).
  4. MAP reading is less than 50 kPa for a TP sensor skewed high test.
  5. MAP reading is greater than 70 kPa for a TP sensor skewed low test.
  6. MAP is steady for 5 seconds or more.

Conditions for setting DTC

  1. TP sensor reading is greater than a predicted value when MAP is less 50 kPa.
  2. TP sensor reading is less than a predicted value when MAP is greater than 70 kPa.
  3. Conditions are present for 5 seconds.

DTC will run when ignition is on and DTC will set when TP sensor signal voltage is less than 0.1 volt for more than one second.

DTC will run when ignition is on, and will set when TP sensor signal voltage is greater than 4.9 volts for longer than one second.

Conditions for running DTC

  1. DTC will only run once per ignition cycle within enabling conditions.
  2. DTCs P0112, P0113, P0117, P0118, P1111, P1112, P1114 or P1115 is not set.
  3. Minimum air temperature is greater than 19°F (-7°C).
  4. Start-up engine coolant temperature is less than 104°F (40°C).
  5. Region 1 - Air temperature greater than 50°F (10°C) and start-up engine coolant temperature is greater than 14°F (-10°C).
  6. Region 2 - Air temperature greater than 19°F (-7°C) and start-up engine coolant temperature is 19-50°F (-7°C to 10°C).
  7. Region 3 - Air temperature greater than 19°F (-7°C) and start-up engine coolant temperature is -40°F to 19°F (-40°C to -7°C).

Conditions for setting DTC

  1. Region 1 - Engine run time is more than 6 seconds in order to achieve closed-loop temperature of 14°F (-10°C). Calibrated minimum amount of airflow has been exceeded. Maximum idle time has been less than 5 seconds.
  2. Region 2 - Engine run time is more than 154 seconds in order to achieve closed-loop temperature of 14°F (-10°C). Calibrated minimum amount of airflow has been exceeded. Maximum idle time has been less than 120 seconds.
  3. Region 3 - Engine run time is more than 287 seconds in order to achieve closed-loop temperature of 14°F (-10°C). Calibrated minimum amount of airflow has been exceeded. Maximum idle time has been less than 225 seconds.

Conditions for running DTC

  1. DTC will only run once per ignition cycle within enabling conditions. DTCs P0112, P0113, P0117, P0118, P1111, P1112, P1114 or P1115 is not set.
  2. Coolant temperature is greater than -40°F (-40°C).
  3. Coolant temperature is less than 172°F (78°C).
  4. Air temperature is greater than 19°F (-7°C).
  5. Engine has been running more than 2 minutes, but less than 30 minutes.
  6. Vehicle speed is greater 15 MPH for more than one mile.
  7. Mass airflow average reading is more than 15 grams/second.

Conditions for setting DTC

  1. The time for engine coolant to reach a preset temperature has been exceeded.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0410, P0440, P0442, P0443, P0446, P0449 or P1441 is not set.
  2. Engine has been running for at least 4 minutes.
  3. Engine coolant temperature is at least 158°F (70°C).
  4. Engine speed is at 550-3000 RPM.
  5. Airflow is 8-35 grams/second.
  6. Throttle angle is 3-35 percent.
  7. Ignition voltage is greater than 9 volts, but less than 18 volts.

Conditions for setting DTC

  1. PCM detects an active sensor with an improper HO2S voltage amplitude.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0410, P0440, P0442, P0443, P0446, P0449 or P1441 is not set.
  2. System voltage is greater than 9 volts.
  3. Closed-loop commanded air-to-fuel ratio is 12-16.5.
  4. Throttle angle is 3-35 percent.

Conditions for setting DTC

  1. HO2S 1 signal voltage remains less 175 millivolts during normal closed-loop operation.
  2. HO2S 1 signal voltage remains less than 600 millivolts during power enrichment mode fuel control operation.
  3. Either condition is present for up to 50 seconds.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0410, P0440, P0442, P0443, P0446, P0449 or P1441 is not set.
  2. System voltage is greater than 9 volts.
  3. Closed-loop commanded air-to-fuel ratio is 12.0-16.5.
  4. Throttle angle is 3-35 percent.

Conditions for setting DTC

  1. HO2S 1 signal voltage remains greater than 975 millivolts during normal closed-loop operation.
  2. HO2S 1 signal voltage remains greater than 200 millivolts during deceleration fuel mode operation.
  3. Either condition is present for up to 50 seconds.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0410, P0440, P0442, P0443, P0446, P0449 or P1441 is not set.
  2. Transmission is not in Park or Neutral.
  3. Engine has been running for at least 4 minutes.
  4. Mass airflow is 8-35 grams/second.
  5. Engine speed is 550-3000 RPM.
  6. Throttle angle 3-35 percent.
  7. System voltage is 9-18 volts.
  8. Engine coolant temperature is greater than 158°F (70°C).

Conditions for setting DTC

  1. HO2S 1 lean-to-rich average transition response time was more than 95 milliseconds.
  2. HO2S 1 rich-to-lean average transition response time was more than 105 milliseconds.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0410, P0440, P0442, P0443, P0446, P0449 or P1441 is not set.
  2. Engine is running for at least 4 minutes.
  3. Ignition voltage is greater than 9 volts, but less than 18 volts.

Conditions for setting DTC

  1. HO2S 1 signal voltage remains between 408-512 millivolts for more than 30 seconds.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0410, P0440, P0442, P0443, P0446, P0449 or P1441 is not set.
  2. Ignition voltage is more than 9 volts, and less than 18 volts.
  3. Engine run time is more than 4 minutes.
  4. Engine coolant temperature is greater than 158°F (70°C).
  5. Engine RPM is 650-2500 RPM.
  6. Airflow is 4-26 grams/second.

Conditions for setting DTC

  1. HO2S 1 heater current is not within the calibrated range.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0410, P0440, P0442, P0443, P0446, P0449 or P1441 is not set.
  2. Closed-loop commanded air/fuel ratio is 12.0-16.5.
  3. Throttle angle is 3-40 percent.

Conditions for setting DTC

  1. HO2S 2 signal voltage remains less than 30 millivolts during normal closed-loop operation.
  2. HO2S 2 signal voltage remains less than 550 millivolts during power enrichment mode fuel control operation.
  3. Condition is present for up to 2.5 minutes.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0410, P0440, P0442, P0443, P0446, P0449 or P1441 is not set.
  2. Closed-loop commanded air/fuel ratio is 12.0-16.5.
  3. Throttle angle is 3-40 percent.

Conditions for setting DTC

  1. HO2S 2 signal voltage remains greater than 999 millivolts during normal closed-loop operation.
  2. HO2S 2 signal voltage remains greater than 200 millivolts during deceleration fuel mode operation.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201-P0206, P0410, P0440, P0442, P0443, P0446, P0449 or P1441 is not set.
  2. Engine has been running for at least 4 minutes.

Conditions for setting DTC

  1. HO2S 2 signal voltage remains between 412-500 millivolts for up to 90 seconds.
  2. Ignition voltage should be greater than 9 volts, but less than 18 volts.
  3. Test only runs once per trip.
  4. TP sensor change of more than 8 percent at least twice during the test.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0410, P0440, P0442, P0443, P0446, P0449 or P1441 is not set.
  2. Engine has been running for at least 4 minutes.

Conditions for setting DTC

  1. HO2S 2 signal voltage remains between 412-500 millivolts for up to 90 seconds.
  2. Ignition voltage should be greater than 9 volts, but less than 18 volts.
  3. Test only runs once per trip.
  4. TP sensor change of more than 8 percent at least twice during the test.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0410, P0440, P0442, P0443, P0446, P0449 or P1441 is not set.
  2. System voltage is 9-18 volts.
  3. Intake air temperature is less than 95°F (35°C) at start-up.
  4. Engine coolant temperature is less than 95°F (35°C) at start-up.
  5. Intake air temperature and engine coolant temperature are within 42°F (6°C) of each other at start-up.

Conditions for setting DTC

  1. HO2S 2 voltage remains within 150 millivolts of bias voltage or about 450 millivolts for a longer amount of time than it should. Amount of time ranges between 100-130 seconds depending on engine coolant temperature at start-up and average airflow since start-up.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0121, P0122, P0123 , P0130, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0401, P0403, P0404, P0405, P0410, P0440, P0442, P0446, P0506, P0507, P1404 or P1441 is not set.
  2. Engine coolant temperature is 68-230°F (20-110°C).
  3. Intake air temperature is 64-158°F (18-70°C).
  4. MAP is 2.6-15.2 psi (18-105 kPa).
  5. Vehicle speed is less than 82 MPH.
  6. Engine speed is 550-4000 RPM.
  7. Barometric pressure is greater than 10.1 psi (70 kPa).
  8. MAF is 2.8-150.0 grams/second.
  9. Fuel level greater than 10 percent.

Conditions for setting DTC

  1. Average long term fuel trim value is greater than 20 percent.
  2. All conditions are present for 6 seconds.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0121, P0122, P0123, P0130, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0401 , P0403, P0404, P0405, P0410, P0412, P0418, P0440, P0442, P0446, P0506, P0507, P1404 or P1441 is not set.
  2. Engine coolant temperature is 68-239°F (20-110°C).
  3. Intake air temperature is 64-158°F (18- 70°C).
  4. MAP is 2.1-15.2 psi (15-105 kPa).
  5. Vehicle speed is less than 82 MPH.
  6. Engine speed is 550-4000 RPM.
  7. MAF 2.8-150.0 grams/second.
  8. Fuel level is more than 10 percent.

Conditions for setting DTC

  1. Average long term fuel trim value is less than -13 percent.
  2. Condition present for 40 seconds.

Conditions for running DTC

  1. Engine is running.
  2. Ignition voltage is 9-18 volts.

Conditions for setting DTC

  1. PCM detects an incorrect voltage on fuel injector control circuit for 30 seconds.

Conditions for running DTC

  1. Ignition is on.
  2. System voltage is 9-18 volts.

Conditions for setting DTC

  1. PCM detects an incorrect voltage on control circuit of fuel pump relay.
  2. Condition exists for less than one second.

Conditions for running DTC

  1. DTCs P0101, P0102, P0107, P0108, P0117, P0118, P0121, P0122, P0123, P0125, P0336, P0341, P0502, P0503, P1106, P1107, P1114, P1115, P1121, P1122, P1336, P1351, P1352, P1361, P1362 or P1374 is not set.
  2. Engine speed is at least 525 RPM, but not greater than 5900 RPM.
  3. System voltage is 9-18 volts.
  4. Engine coolant temperature is at least 21°F (-7°C), but not greater than 255°F (125°C).
  5. Throttle angle is steady.

DTC will set when PCM is detecting a crankshaft rotation speed variation indicating a misfire rate sufficient to cause the emissions levels to exceed the mandated standard.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0117, P0118, P0121, P0122, P0123, P0125, P0336, P1114, P1115, P1121, P1122 or P1336 is not set.
  2. Engine speed is 1000-5000 RPM.
  3. Throttle angle is greater than 15 percent.
  4. Engine load is greater than 40 percent.
  5. Engine coolant temperature is greater than 153°F (60°C).
  6. Maximum spark retard is less than 15 degrees.
  7. System voltage is greater than 9 volts.
  8. Engine run time is greater than 30 seconds.

Conditions for setting DTC

  1. PCM detects a malfunction in the integrated knock sensor diagnostic circuitry which will not allow proper diagnosis of the knock sensor circuit.
  2. Conditions exist for at least one second.

Conditions for running DTC

  1. DTCs P0112, P0113, P0121, P0122, P0123, P0336, P0341, P0506 or P0507 is not set.
  2. Engine speed is 1000-5000 RPM.
  3. Engine has been running for a minimum of 30 seconds.
  4. Throttle angle is greater than 15 percent.
  5. Engine load is greater than 40 percent.
  6. Engine coolant temperature is greater than 153°F (60°C).
  7. Maximum spark retard is less than 15 degrees.
  8. System voltage is greater than 9 volts.

Conditions for setting DTC

  1. PCM detects a knock sensor signal voltage within the calculated average voltage range for at least 10 seconds.
  2. Engine run time is greater than 30 seconds.

Conditions for running DTC

  1. Engine is running.
  2. 3X reference pulses are being received for a minimum of 3 seconds.

Conditions for setting DTC

  1. Ratio of 24X reference pulses to 3X reference pulses received by PCM is incorrect.

Conditions for running DTC

  1. Engine is running and 3X reference pulses are being received.

Conditions for setting DTC

  1. CMP sensor reference pulse is not detected during every engine cycle.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0336, P0403, P0404, P0502, P0503, P0506, P0507, P1106, P1107, P1111, P1112, P1114, P1115, P1121, P1122, P1374 or P1404 is not set.
  2. System voltage is 10-18 volts.
  3. AC status does not change.
  4. Transmission range does not change
  5. TP sensor angle is less than one percent at deceleration.
  6. Intake air temperature is greater than 176°F (80°C).
  7. Engine coolant temperature is greater than 167°F (75°C).
  8. Engine speed is 1050-1400 RPM.
  9. Idle air control valve position steady.
  10. MAP is steady between 15-70 kPa.
  11. Vehicle speed is greater than 30 MPH during deceleration.
  12. Vehicle will need to be driven at more than 50 MPH and then allowed to decelerate. When vehicle is decelerating while meeting all of the criteria listed, PCM will enable the test to run. As test is running, desired EGR parameter and EGR position sensor will change from zero to a calibrated value greater than zero will be observed on scan tool.

Conditions for setting DTC

  1. MAP changes monitored during the EGR flow test indicating an insufficient EGR flow.

Conditions for running DTC

  1. Ignition is on.
  2. System voltage is 9-18 volts.

Conditions for setting DTC

  1. PCM detects an electrical malfunction in the EGR high control circuit or EGR low control circuit.
  2. Condition is present for more than 20 seconds.

Conditions for running DTC

  1. Ignition voltage is greater than 11 volts.
  2. PCM has enabled the EGR valve.

Conditions for setting DTC

  1. Vehicle must be driven.
  2. Difference between EGR position sensor and desired EGR position is greater than 15 percent.
  3. Condition is present for more than 20 seconds.

Conditions for running DTC

  1. System voltage greater than 11 volts.
  2. Ignition is on.

Conditions for setting DTC

  1. EGR position sensor is less than 0.35 volt at anytime.
  2. Condition is present for more than 20 seconds.

Conditions for running DTC

  1. DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0171, P0172, P0440, P0442, P0443, P0446, P0449, P1106, P1107, P1111, P1112, P1114, P1115, P1121, P1122, P1133, P1134 or P1441 is not set.
  2. Engine coolant temperature is at 40-230°F (4.4-110°C).
  3. Start-up engine coolant temperature is less than 158°F (70°C).
  4. Engine operates for more than 210 seconds.
  5. Intake air temperature is at 40-158°F (4.4-70°C).
  6. Short term FT is -3 and 4.
  7. Engine load is 24-37 percent.
  8. MAP is greater than 40 kPa.
  9. BARO is greater than 75 kPa.
  10. MAF is 11-18.5 grams/second.
  11. Engine speed is greater than 1200 RPM.
  12. Ignition voltage is 10-18 volts.
  13. Vehicle speed is greater than 5 MPH.

Conditions for setting DTC

  1. Pre-catalyst HO2S voltage remains greater than a predetermined lean value during test.
  2. Short term FT does not increase a calibrated amount during the test.
  3. Both conditions exist for 3 consecutive tests.

Conditions for running DTC

  1. Engine is running for more than 30 seconds.
  2. System voltage is 9-18 volts.

Conditions for setting DTC

  1. PCM detects an improper voltage level on control circuit.
  2. Condition exists for more than 30 seconds.

Conditions for running DTC

  1. Engine has been running for more than 30 seconds.
  2. System voltage is 9-18 volts.

Conditions for setting DTC

  1. PCM detects an improper voltage level on control circuit.
  2. Condition exists for more than 30 seconds.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0122, P0123, P0125, P0128, P0130, P0131, P0132, P0133, P0134, P0135, P0137, P0140, P0141, P0171, P0172, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0325, P0327, P0336, P0341, P0401, P0403, P0404, P0405, P0440, P0442, P0443, P0446, P0449, P0502, P0503, P0506, P0507, P1133, P1134, P1336, P1351, P1352, P1361, P1362, P1404 and P1441 is not set.
  2. No EGR, VSS, EVAP sensor, misfire, PRNDL, AIR or IAC valve DTCs set.
  3. Engine has been running longer than 10 minutes
  4. Engine coolant temperature is 158-255°F (70-24°C).
  5. BARO is greater than 75 kPa.
  6. Engine is in closed-loop operation.
  7. IAT is greater than -4°F (-20°C), but less than 212°F (100°C).
  8. Battery voltage is greater than 10.7 volts.

Conditions for setting DTC

  1. PCM determines that the catalyst's oxygen storage capacity is less than a threshold considered acceptable.

Conditions for running DTC

  1. DTC P0107. P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0443, P0449, P0452, P0453, P1106. P1107, P1111, P1112, P1114, P1115, P1121 or P1122 is not set
  2. Ignition voltage is 10-18 volts.
  3. Barometric pressure is greater than 75 kPa.
  4. Fuel level is 15-85 percent.
  5. Engine coolant temperature is 39-86°F (4-30°C).
  6. Intake air temperature is 39-86°F (4-30°C).
  7. Start-up engine coolant temperature and intake air temperature are within 16°F (9°C) of each other.
  8. Vehicle speed is less than 75 MPH.

Conditions for setting DTC

  1. EVAP system is not able to achieve or maintain vacuum during the diagnostic test.

Conditions for running DTC

  1. DTCs P0107. P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0440, P0443, P0449, P0452, P0453, P1106. P1107, P1111, P1112, P1114, P1115, P1121 or P1122 is not set.
  2. Ignition voltage is 10-18 volts.
  3. Barometric pressure is greater than 75 kPa.
  4. Fuel level is 15-85 percent.
  5. Engine coolant temperature and intake air temperature is 39-86°F (4-30°C).
  6. Start-up engine coolant temperature and intake air temperature are within 16°F (9°C) of each other.
  7. Vehicle speed is less than 75 MPH.

Conditions for setting DTC

  1. EVAP system can achieve vacuum, but a vacuum decay is detected during the test.

Conditions for running DTC

  1. The engine speed is greater than 400 RPM.
  2. System voltage is 6-18 volts.

Conditions for setting DTC

  1. PCM detects that the commanded state of the driver and actual state of control circuit do not match.
  2. Conditions are present for a minimum of 5 seconds.

Conditions for running DTC

  1. DTCs P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0440, P0442, P0443, P0449, P0452, P0453, P1106, P1107, P1112, P1114, P1115, P1121 or P1122 is not set.
  2. Ignition voltage is 10-18 volts.
  3. Barometric pressure is greater than 75 kPa.
  4. Fuel level is 15-85 percent.
  5. Engine coolant temperature and intake air temperature is 39-86°F (4-30°C).
  6. Start-up engine coolant temperature and intake air temperature are within 16°F (9°C) of each other.
  7. Vehicle speed is less than 75 MPH.

Conditions for setting DTC

  1. Fuel tank pressure is less than -10 in. H2O.
  2. Condition is present for a minimum of 30 seconds.

Conditions for running DTC

  1. DTCs P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0440, P0442, P0443, P0449, P0452, P0453, P1106, P1107, P1111, P1112, P1114, P1115, P1121 or P1122 is not set.
  2. Ignition voltage is 10-18 volts.
  3. Barometric pressure is greater than 75 kPa.
  4. Fuel level is 15-85 percent.
  5. Engine coolant temperature and intake air temperature is 39-86°F (4-30°C).
  6. Start-up engine coolant temperature and intake air temperature are within 16°F (9°C) of each other.
  7. Vehicle speed is less than 75 MPH.

Conditions for setting DTC

  1. Fuel tank pressure is less than -10 in. H2O.
  2. Condition is present for a minimum of 30 seconds.

Conditions for running DTC

  1. Engine speed is greater than 400 RPM.
  2. System voltage is 6-18 volts.

Conditions for setting DTC

  1. PCM detects that the commanded state of the driver and actual state of control circuit do not match.
  2. Conditions are present for a minimum of 5 seconds.

DTC will run when ignition is on and DTC will set when fuel tank pressure sensor voltage is less than 0.1 volt for more than 5 seconds.

DTC will run when ignition is on and DTC will set when FTP sensor voltage is greater than 4.9 volts for more than 5 seconds.

Conditions for running DTC

  1. Ignition is on.
  2. System voltage is 11-16 volts.

Conditions for setting DTC

  1. Fuel level signal voltage is less than 3.5 percent (0.4 volt).
  2. Condition is present for greater than 10 seconds.

Conditions for running DTC

  1. Ignition is on.
  2. System voltage is 11-16 volts.

Conditions for setting DTC

  1. Fuel level signal voltage is greater than 3 volts (98 percent).
  2. Condition is present for at least 10 seconds.

DTC will set when ignition on and an improper voltage level has been detected on the low speed cooling fan relay control circuit for at least 30 seconds.

DTC will set when ignition is on and an improper voltage level has been detected on the high speed cooling fan relay control circuit for at least 30 seconds.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0171, P0172, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0401, P0403, P0404, P0405, P0443, P1121, P1404 or P1441 is not set.
  2. Engine run time is greater than 2 minutes.
  3. Engine coolant temperature is greater than 158°F (70°C).
  4. Intake air temperature is greater than 0.4°F (-18°C).
  5. BARO is greater than 70 kPa.
  6. Ignition voltage is 9-18 volts.
  7. TP sensor is less than 1.5 percent.
  8. VSS is less than 3 MPH.
  9. Conditions present for 8 seconds.

Conditions for setting DTC

  1. Actual engine speed is 100 RPM less than the desired engine speed.
  2. Diagnostic must fail 4 consecutive tests per key cycle.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0171, P0172, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0401, P0403, P0404, P0405, P0443, P1121, P1404 or P1441 is not set.
  2. Engine run time is greater than 2 minutes.
  3. Engine coolant temperature is greater than 158°F (70°C).
  4. Intake air temperature is greater than 0.4°F (-18°C).
  5. BARO is greater than 70 kPa.
  6. Ignition voltage is 9-18 volts.
  7. TP sensor is less than 1.5 percent.
  8. VSS is less than 3 MPH.
  9. Conditions are present for 5 seconds.

Conditions for setting DTC

  1. Actual engine speed is 150 RPM greater than desired engine speed.
  2. The diagnostic must fail 4 consecutive tests per key cycle.

DTC will run when engine is running and A/C has been requested.

DTC will set when PCM detects that signal circuit is less than 5 counts (0.09 volt) or greater than 250 counts (4.9 volts) for 20 seconds.

Conditions for running DTC

  1. System voltage less 11 volts.
  2. Engine speed greater than 1500 RPM.
  3. Vehicle speed less than 25 MPH.

DTC will set when PCM detects a system voltage out of range for 2 seconds.

DTC will set when PCM detects an internal program fault (check sum error).

DTC will set when PCM does not contain the correct program required to operate the vehicle.

DTC will run when engine is running and DTC will set when generator turn on signal circuit voltage is low while PCM is commanding the generator on, and condition is present for 30 seconds.

DTC will set when ignition is on and an improper voltage level has been detected on MIL control circuit for at least 30 seconds.

Conditions for running DTC

  1. No VSS DTC P0502 or P0503.

Conditions for setting DTC

TCC brake switch indicates continuously open (zero volts) for more than 15 minutes and the following conditions occur 8 times consecutively.

  1. Vehicle speed less than 5 MPH.
  2. Vehicle speed 5-20 MPH for at least 3 seconds.
  3. Vehicle speed remains greater than 20 MPH for 6 seconds.

Conditions for running DTC

  1. No VSS DTC P0502 or P0503 set.

Conditions for setting DTC

TCC brake switch indicates continuously CLOSED (12 volts) while the following conditions occur 8 times consecutively

  1. Vehicle speed greater than 20 MPH for 6 seconds.
  2. Vehicle speed decreases to 5 MPH in 3 seconds.
  3. Vehicle speed is less than 5 MPH.

Conditions for running DTC

  1. DTCs P0121, P0122 or P0123 is not set.
  2. Engine has been running for a length of time that is determined by the start-up coolant temperature. The length of time ranges from 2 minutes at less than 22°F (6°C) to one second at greater than 86°F (30°C).
  3. Throttle angle is less than 2 percent when engine speed is less than 3000 RPM.
  4. Throttle angle is less than 30 percent when engine speed is greater than 3000 RPM.

Conditions for setting DTC

  1. MAP sensor voltage is intermittently greater than 4.2 volts.

Conditions for running DTC

  1. DTCs P0121, P0122 or P0123 is not set.
  2. Ignition is on.
  3. Throttle angle is greater than zero percent when engine speed is less than 1000 RPM.
  4. Throttle angle is greater than 10 percent when engine speed is greater than 1000 RPM.

Conditions for setting DTC

  1. MAP sensor voltage is intermittently less than 0.1 volt.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0117, P0118, P0125, P0128, P0502, P0503, P1114 or P1115 is not set.
  2. Vehicle speed is less than 35 MPH.
  3. Mass airflow is less than 12 grams/second.
  4. Engine coolant temperature is greater than 140°F (60°C).
  5. Engine run time is more than 3 minutes.

Conditions for setting DTC

  1. DTC will set when IAT signal voltage indicates an intake air temperature intermittently less than -35°F (-37°C) and condition is present for up to 5 seconds.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0117, P0118, P0125, P0128, P0502, P0503, P1114 and P1115 is not set.
  2. Engine has been running for more than 10 seconds.
  3. Vehicle speed is greater than 25 MPH.

Conditions for setting DTC

  1. IAT sensor indicates an intake air temperature intermittently greater than 275°F (135°C).
  2. Condition is present for up to 5 seconds.

DTC will run when engine run time is greater than 5 seconds and will set when PCM detects an intermittent high ECT sensor temperature while engine is running and run time exceeds 5 seconds.

DTC will set when PCM detects an intermittent low ECT sensor temperature while engine is running for more than 5 seconds.

DTC will set when ignition is on and TP sensor intermittently indicates a throttle position signal voltage greater than 4.9 volts for 0.5 second.

DTC will set when ignition is on and TP sensor intermittently indicates a throttle position signal less than 0.95 volt for 0.5 second.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0410, P0440, P0442, P0443, P0446, P0449 or P1441 is not set.
  2. System voltage is greater than 9 volts.
  3. Engine operating in closed-loop.
  4. Engine coolant temperature is greater than 158°F (70°C).
  5. TP sensor angle is greater than 2 percent.
  6. Engine speed is 1300-3000 RPM.
  7. MAF is 13-29 grams/second.
  8. Conditions are stable for 3 seconds.

Conditions for setting DTC

  1. PCM monitors fewer than 25 rich-to-lean and 25 lean-to-rich switches for HO2S 1.
  2. Condition is present for a 100-second monitoring period.

Conditions for running DTC

  1. DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0201, P0202, P0203, P0204, P0205, P0206, P0300, P0410, P0440, P0442, P0443, P0446, P0449 or P1441 is not set.
  2. System voltage is greater than 9 volts.
  3. Engine is operating in closed-loop.
  4. Engine is running for at least 60 seconds.
  5. Engine coolant temperature is greater than 122°F (50°C).
  6. TP sensor angle is greater than 2 percent.
  7. MAF is 13-29 grams/second.
  8. Engine speed is 1300-3000 RPM.
  9. MAF is 13-29 grams/second.

Conditions for setting DTC

  1. Conditions are present for a 100 second monitoring period.
  2. Ratio of average responses is not between 4.2 and 0.4.

Conditions for running DTC

  1. Ignition is on, with engine off.
  2. DTCs P0117, P0118, P1111 and P1114 is not set.

Conditions for setting DTC

  1. PCM detects engine oil pressure switch signal circuit is low.
  2. Condition is present for greater than 10 seconds.

Conditions for running DTC

  1. Engine coolant temperature is greater than 149°F (69°C).
  2. DTC P0336, P0341 or P1374 is not set.

Conditions for setting DTC

  1. Crankshaft position system variation values are not stored in PCM memory.

DTC will run when engine speed is greater than 600 RPM. DTC will set when PCM detects an open in IC timing signal circuit and present for 300 3X reference periods or 100 crankshaft revolutions.

DTC will run when engine is running. DTC will set when PCM detects an open circuit in the IC signal circuit and condition is present for 300 3X reference periods or 106 crankshaft revolutions.

Conditions for running DTC

  1. Engine speed is greater than 600 RPM.
  2. DTC P1351 is not set.

Conditions for setting DTC

  1. PCM does not monitor IC pulses while IC mode spark advance is commanded.
  2. Condition is present for 300 3X reference periods or 100 crankshaft revolutions.

DTC will run when engine is running.

Conditions for setting DTC

  1. PCM detects a short to voltage in the IC timing signal circuit.
  2. Condition is present for 300 3X reference periods or 100 crankshaft revolutions.

Conditions for running DTC

  1. Engine is running and 24X reference pulses are being received.

Conditions for setting DTC

  1. Ratio of 24X reference pulses to 3X reference pulses received by PCM does not equal 8.
  2. Ratio of 24X reference pulses to camshaft position PCM input pulses received by PCM equals 48.
  3. Conditions are present for more than 10 seconds.

Conditions for running DTC

  1. Engine load is less than 87 percent.
  2. Engine speed is less than 5000 RPM.
  3. A misfire DTC is occurring and requesting MIL to be illuminated.

Conditions for setting DTC

  1. PCM has detected a EBCM/EBTCM rough road sensing error.

Conditions for running DTC

  1. Engine load is less than 87 percent.
  2. Engine speed is less than 5000 RPM.
  3. Vehicle speed is greater than 10 MPH.
  4. Misfire DTC is occurring and requesting MIL to be illuminated.

Conditions for setting DTC

  1. PCM is detecting a loss of communication with EBCM/EBTCM for at least 5 seconds.

Conditions for running DTC

  1. System voltage is greater than 11 volts.
  2. PCM has enabled EGR valve.

Conditions for setting DTC

  1. Vehicle must be driven.
  2. EGR position sensor is 0.2 volt more than the EGR learned minimum position when desired EGR position is commanded to zero percent.
  3. Condition is present twice.

Conditions for running DTC

  1. DTCs P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0440, P0442, P0446, P0443, P0449, P0452, P0453, P1106, P1107, P1111, P1112, P1114, P1115, P1121 or P1122 is not set.
  2. Ignition voltage is 10-18 volts.
  3. Barometric pressure is greater than 75 kPa.
  4. Fuel level is 15-85 percent.
  5. Engine coolant temperature and intake air temperature is 39-86°F (4-30°C).
  6. Start-up engine coolant temperature and intake air temperature is within 16°F (9°C) of each other.
  7. Vehicle speed is less than 75 MPH.

Conditions for setting DTC

  1. PCM detects vacuum during a non-purge condition.

Conditions for running DTC

  1. DTCs P0107. P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0443, P0449, P0452, P0453, P1106. P1107, P1111, P1112, P1114, P1115, P1121 or P1122 is not set.
  2. Ignition voltage is 10-18 volts.
  3. Barometric pressure is greater than 75 kPa.
  4. Fuel level is 15-85 percent.
  5. Engine coolant temperature and intake air temperature is 39-86°F (4-30°C).
  6. Start-up engine coolant temperature and intake air temperature is within 16°F (9°C) of each other.
  7. Vehicle speed is less than 75 MPH.

Conditions for setting DTC

  1. PCM detects vacuum during a non-purge condition.

Conditions for running DTC

  1. Ignition voltage is 9-18 volts.
  2. Engine speed is greater than 80 RPM.
  3. PCM driver is activated.

Conditions for setting DTC

  1. PCM detects an improper voltage level on the output circuit that controls the A/C relay.
  2. Condition is present for at least 30 seconds.

Conditions for running DTC

  1. DTC will run when engine is running.

Conditions for setting DTC

  1. PCM detects that requested torque signal is out of valid range.
  2. PCM does not receive requested torque signal.

DTC will run when ignition is on and DTC will set when PCM has detected a loss of the state of health serial data message from the theft deterrent control module.

DTC will run when ignition is on and DTC will set when PCM remains in theft deterrent password learn mode for more than 2 seconds.

DTC will run when ignition is on and DTC will set when PCM detects an incorrect password from the theft deterrent control module.

DTC will run when ignition is on and DTC will set when PCM detects a voltage out of range/tolerance on the 5-volt reference circuit for more than 10 seconds.

DTC will run when engine is running and DTC will set when PCM detects a voltage out of tolerance condition on the 5-volt reference 2 circuit for more than 10 seconds.

DTC will run when engine is running and DTC will set when PCM detects a voltage out of tolerance condition on the 5-volt reference "B" circuit for more than 10 seconds.

DTC will run when ignition is on and DTC will set when ODM has detected a voltage greater than 33 volts or excessive current is detected on any circuit to ODM for 30 seconds.

DTC will run when ignition is on and DTC will set when ODM has detected a voltage greater than 33 volts or excessive current is detected on any circuit to ODM for 30 seconds.

DTC will run when ignition is on and DTC will set when ODM has detected a voltage greater than 33 volts or excessive current is detected on any circuit to ODM for 30 seconds.

DTC will run when ignition is on and DTC will set when ODM has detected a voltage greater than 33 volts or excessive current is detected on any circuit to ODM for 30 seconds.

DTC will run when engine is running and DTC will set when PCM detects that the delivered torque signal voltage is invalid.

More articles — Engine Controls Self-Diagnostics - 3.4L