Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

CHECK FOR AN ACTIVE DTC
1. Attempt to start the engine. If the engine will not start, crank the engine for five seconds.
  WARNING:
  When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.
2. With the scan tool, read DTCs and record on the repair order.
  Is the DTC active or pending?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE (F855) PRIMARY 5-VOLT SUPPLY VOLTAGE
1. Turn the ignition off.
2. Disconnect the Throttle Body harness connector.
3. Turn the ignition on.
4. Measure the voltage on the (F855) 5-Volt Supply circuit in the Throttle Body harness connector.
  Is the voltage between 4.9 and 5.1 volts?
  
  Yes
  - Go To 3
  No
  - Go To 4
THROTTLE BODY
1. Turn the ignition off.
2. Connect the Throttle Body harness connector.
3. Disconnect the Crankshaft Position Sensor harness connector.
4. Turn the ignition on.
5. Measure the voltage on the (F855) 5-Volt Supply circuit at the Crankshaft Position Sensor harness connector.
  Is the voltage between 4.9 and 5.1 volts?
  
  Yes
  - Replace the Throttle Body in accordance with the Service Information because the Throttle Body is pulling the 5 volt supply low. Refer to THROTTLE BODY, REMOVAL . After installing the new Throttle Body, use a scan tool and perform the ETC RELEARN function.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 9
CRANKSHAFT POSITION SENSOR
1. Turn the ignition off.
2. Disconnect the Crankshaft Position Sensor harness connector.
3. Turn the ignition on.
4. Continue measuring the voltage of the (F855) 5-Volt Supply circuit at the Throttle Body harness connector.
  Is the voltage between 4.9 and 5.1 volts?
  
  Yes
  - Replace the Crankshaft Position Sensor in accordance with the Service Information. Refer to SENSOR, CRANKSHAFT POSITION, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
EOP SENSOR
1. Turn the ignition off.
2. Disconnect the EOP Sensor harness connector.
3. Turn the ignition on.
4. Continue measuring the voltage of the (F855) 5-Volt Supply circuit at the Throttle Body harness connector.
  Is the voltage between 4.9 and 5.1 volts?
  
  Yes
  - Replace the EOP Sensor in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 6
ACCELERATOR PEDAL POSITION SENSOR
1. Turn the ignition off.
2. Disconnect the APP Sensor harness connector.
3. Turn the ignition on.
4. Continue measuring the voltage of the (F855) 5-Volt Supply circuit at the Throttle Body harness connector.
  Is the voltage between 4.9 and 5.1 volts?
  
  Yes
  - Replace the APP Sensor in accordance with the Service Information. Refer to PEDAL, ACCELERATOR, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 7
A/C PRESSURE TRANSDUCER
1. Turn the ignition off.
2. Disconnect the A/C Pressure Transducer harness connector.
3. Turn the ignition on.
4. Continue measuring the voltage of the (F855) 5-Volt Supply circuit at the Throttle Body harness connector.
  Is the voltage between 4.9 and 5.1 volts?
  
  Yes
  - Replace the A/C Pressure Transducer in accordance with the Service Information. Refer to TRANSDUCER, A/C PRESSURE, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 8
CHECK THE 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the PCM C1 and C2 harness connectors.
3. Check for continuity between ground and the (F855) 5-Volt Supply circuit.
4. Check for continuity between ground and the (K852) 5-Volt Supply circuit.
  Is there continuity between ground and either circuit?
  
  Yes
  - Repair the 5-Volt Supply circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 9
POWERTRAIN CONTROL MODULE (PCM)
1. Inspect the (F855) 5-Volt Supply circuit between the Crankshaft Position Sensor harness connector and the PCM harness connector.
2. Inspect the (F855) 5-Volt Supply circuit between the Throttle Body harness connector and the PCM harness connector.
3. Inspect the (F855) 5-Volt Supply circuit between the Oil Pressure Sensor harness connector and the PCM harness connector.
4. Inspect the (F855) 5-Volt Supply circuit between the A/C Pressure Sensor harness connector and the PCM harness connector.
5. Inspect the (K852) 5-Volt Supply circuit between the Accelerator Pedal Position Sensor harness connector and the PCM harness connector.
6. Look for any chafed, pierced, pinched, or partially broken wires.
7. Look for broken, bent, pushed out or corroded terminals.
8. Perform any Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .