QT1 PERFORM PCM QUICK TEST
Note. If the vehicle was brought in with an emission compliance failure symptom, GO to M: Emission Compliance STEP EM1.
- Complete preliminary checks looking for obvious concerns that may relate to the symptom. Check items such as those listed: Related electrical connectors or fuses Vacuum lines (leaks, routing) Air intake system (leaks, restrictions) Fuel quality (octane, contamination, winter/summer blend) Cooling system (engine operating at proper temperature)
- Access any related TSB information (if available).
- Complete PCM Quick Test to access any DTCs. Note any Key On Engine Off, Key On Engine Running (if engine runs) and Continuous Memory (MIL and non-MIL) DTCs.
Note. If unable to access DTCs, or any scan tool communication concern exists, GO to A: Unable to Activate Self-Test/Network Communication Error/DTC P1001 STEP QA1. For additional information on retrieving MIL and non-MIL DTCs, refer to CONTINUOUS MEMORY SELF-TEST .
Were any DTCs present?
| Yes | No |
|---|---|
| If engine runs rough at idle and Key On Engine Running or Continuous Memory DTC(s) are present: GO to Quick Test QT2 to check injector fault PIDS. All Others: GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS for direction to service DTC(s) after noting the following: Service DTCs in the following order (begin diagnosis with the first DTC output in that mode). Any KOEO DTC(s) Any KOER DTC(s) Any Continuous Memory DTC(s) (retrieve any available Freeze Frame Data) (disregard any identical/related Continuous DTC(s) of DTC(s) already serviced). | GO to STEP 2: NO DTC(S) PRESENT SYMPTOM CHART INDEX for direction to proper STEP 3 Chart. NOTE: If symptom is not listed, REFER to applicable article or GO to Z: Intermittent STEP Z1. |
| NOTE |
|---|
| If symptom is not listed, REFER to applicable article or GO to Z: Intermittent STEP Z1. |
QT2 ENGINE RUNS ROUGH AT IDLE WITH KEY ON ENGINE RUNNING OR CONTINUOUS MEMORY DTC(s): CHECK INJECTOR FAULT (INJxF) PID(s)
Note. An injector circuit fault could result in unrelated DTC(s) being received from the PCM.
- Key on, engine off.
- Access the INJxF PIDs (the "x" indicates the injector number). There will be one INJxF PID for each engine cylinder.
Do any of the INJxF PIDs indicate a fault (or Yes)?
| Yes | No |
|---|---|
| An injector circuit fault exists. KEY OFF. Disregard DTC(s). Natural Gas applications: GO to A: Natural Gas Fuel Control STEP HA27. All Others: GO to H: Fuel Control STEP H46. | No fault detected by injector fault PIDs. KEY OFF. GO to QT1 and follow the YES Action To Take for all others. |
Step 2: No DTC(s) Present Symptom Chart Index
| System/Symptom | Chart Number | |
|---|---|---|
| Starting Concerns | Hard Start/Long Crank/Erratic Start/Erratic Crank | CHART NUMBER: 2 |
| Stall After Start | CHART NUMBER: 1 | |
| No Crank | CHART NUMBER: 23 | |
| No Start (engine cranks) | CHART NUMBER: 3 | |
| Unique Idle Concerns | Slow Return to Idle | CHART NUMBER: 4 |
| Rolling Idle | CHART NUMBER: 1 | |
| Fast Idle | CHART NUMBER: 5 | |
| Low/Slow Idle | CHART NUMBER: 6 | |
DRIVEABILITY
| System/Symptom | Chart Number | |
|---|---|---|
| Stalls/Quits | Idle, Acceleration, Cruise | CHART NUMBER: 1 |
| Deceleration | CHART NUMBER: 6 | |
| Runs Rough | CHART NUMBER: 1 | |
| Misses | CHART NUMBER: 1 | |
| Buck/Jerk | CHART NUMBER: 1 | |
| Hesitation/Stumble | CHART NUMBER: 1 | |
| Surge | CHART NUMBER: 1 | |
| Backfires | CHART NUMBER: 7 | |
| Lack/Loss of Power | CHART NUMBER: 8 | |
| Spark Knock | CHART NUMBER: 9 | |
DRIVEABILITY - PERFORMANCE WHILE DRIVING CONCERNS
| System/Symptom | Chart Number |
|---|---|
| Diesels/Runs On | CHART NUMBER: 5 |
| Poor Fuel Economy | CHART NUMBER: 10 |
| Emissions Compliance | CHART NUMBER: 11 |
| Malfunction Indicator Lamp (MIL) Concern | CHART NUMBER: 12 |
ADDITIONAL DRIVEABILITY CONCERNS
| System/Symptom | Chart Number | |
|---|---|---|
| Warning Indicators | Malfunction Indicator Lamp (MIL) | CHART NUMBER: 12 |
| Transmission Control Indicator Lamp (TCIL) | CHART NUMBER: 12 | |
| Temperature Warning Indicator Lamp or Gauge (applications with CHT sensor only) | CHART NUMBER: 12 | |
| Check Fuel Cap Indicator Lamp | CHART NUMBER: 12 | |
| Climate Control | Lack of A/C cooling, A/C not functioning | CHART NUMBER: 21 |
| A/C always on and/or A/C compressor runs continuously | CHART NUMBER: 21 | |
| A/C does not cut off under WOT conditions (Mustang only) | CHART NUMBER: 21 | |
| Instrumentation | Tachometer Inoperative | CHART NUMBER: 14 |
| Speedometer/odometer Inoperative | CHART NUMBER: 14 | |
| Boost gauge indicates higher than normal boost (supercharger applications) | CHART NUMBER: 14 | |
| Fuel Gauge Inoperative | CHART NUMBER: 14 | |
ELECTRICAL
| System/Symptom | Chart Number | |
|---|---|---|
| Oil System Concerns | High Oil Consumption | CHART NUMBER: 15 |
| Leaks | CHART NUMBER: 15 | |
| Cooling System Concerns | Electric cooling fan(s) does not operate (low, medium, high and/or variable speed) | CHART NUMBER: 16 |
| Electric cooling fan always runs | CHART NUMBER: 17 | |
| Exhaust System Concerns | Visible smoke | CHART NUMBER: 18 |
| Odor (sulfur or "rotten egg" smell) | CHART NUMBER: 22 | |
| Fuel System Concerns | Odor, engine compartment | CHART NUMBER: 19 |
| Engine Noise (under hood) | CHART NUMBER: 20 | |
ENGINE
| System/Symptom | Chart Number | |
|---|---|---|
| Automatic Transmission Shift Concerns | A/T upshift concern | CHART NUMBER: 13 |
| A/T downshift concern | CHART NUMBER: 13 | |
| Engagement concern | CHART NUMBER: 13 | |
DRIVELINE