Diagnostic Test

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

CHECK FOR AN ACTIVE DTC
NOTE:
Improperly installed aftermarket accessories can cause this DTC to set. Check for any improperly installed aftermarket accessories before continuing with this test.
1. Turn the ignition on for at least 60 seconds.
2. With a scan tool, read the active DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the PCM harness connectors.
3. Disconnect the APP Sensor harness connector.
4. Disconnect all the Sensors that share the (F856) 5-Volt Supply circuit.
5. Check for continuity between ground and the (F856) 5-Volt Supply circuit in the MAP Sensor harness connector.
  Is there continuity between ground and the (F856) 5-Volt Supply circuit?
  
  Yes
  - Repair the (F856) 5-Volt Supply circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (K854) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the (K854) 5-Volt Supply circuit in the APP Sensor harness connector.
  Is there continuity between ground and the (K854) 5-Volt Supply circuit?
  
  Yes
  - Repair the (K854) 5-Volt Supply circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
CMP SENSOR 1
1. Turn the ignition off.
2. Reconnect all the previously disconnected Sensors except for the CMP Sensor 1 harness connector.
3. Turn the ignition on.
4. Measure the voltage between ground and the (F856) 5-Volt Supply circuit in the CMP Sensor harness connector.
  Is the voltage below 4.9 volts?
  
  Yes
  - Go To 5
  No
  - Verify that there is good pin to terminal contact in the CMP Sensor and Powertrain Control Module connectors. If OK, replace the Camshaft Position Sensor 1. Refer to SENSOR, CAMSHAFT POSITION, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CMP SENSOR 2
1. Turn the ignition off.
2. Disconnect the CMP Sensor 2 harness connector.
3. Turn the ignition on.
4. Measure the voltage between ground and the (F856) 5-Volt Supply circuit in the CMP Sensor 2 harness connector.
  Is the voltage below 4.9 volts?
  
  Yes
  - Go To 6
  No
  - Verify that there is good pin to terminal contact in the CMP Sensor and Powertrain Control Module connectors. If OK, replace the Camshaft Position Sensor 2. Refer to SENSOR, CAMSHAFT POSITION, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
MAP SENSOR
1. Turn the ignition off.
2. Disconnect the MAP Sensor harness connector.
3. Turn the ignition on.
4. Measure the voltage between ground and the (F856) 5-Volt Supply circuit in the MAP Sensor harness connector.
  Is the voltage below 4.9 volts?
  
  Yes
  - Go To 7
  No
  - Verify that there is good pin to terminal contact in the MAP Sensor and Powertrain Control Module connectors. If OK, replace the MAP Sensor. Refer to SENSOR, MANIFOLD AIR PRESSURE (MAP), REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
ACCELERATOR PEDAL POSITION SENSOR
1. Turn the ignition off.
2. Disconnect the APP Sensor harness connector.
3. Turn the ignition on.
4. Measure the voltage between ground and the (K854) 5-Volt Supply circuit at the APP Sensor harness connector.
  Is the voltage below 4.9 volts?
  
  Yes
  - Go To 8
  No
  - Verify that there is good pin to terminal contact in the Accelerator Pedal Position Sensor and Powertrain Control Module connectors. If OK, replace the Accelerator Pedal Position Sensor. Refer to PEDAL, ACCELERATOR, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensors and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related Sensor and Powertrain Control Module connectors.
4. Perform any Service Bulletins that may apply.
  Were there 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 in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .