Diagnostic Test

WARNING: This page is about a different car, the 2016 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
NOTE:
If there are any 5-Volt Reference DTCs present, diagnose and repair those DTCs before continuing with this test procedure.
1. Turn the ignition on.
2. With the scan tool, navigate to System Test and select the Coolant Three Way Valve Test.
  Did the Coolant Valve Three Way Valve Test pass or fail?
  
  Fail
  - Go To 2
  Pass
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT
1. Turn the ignition off.
2. Disconnect the Coolant Three Way Valve harness connector.
3. Turn the ignition on, engine not running.
4. Measure the voltage on the (F856) 5-Volt Supply circuit at the Coolant Three Way Valve harness connector.
  Is the voltage between 4.9 and 5.1 volts?
  
  Yes
  - Go To 3
  No
  - Repair the (F856) 5-Volt Supply circuit for a an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
CHECK THE (F947) FUSED IGNITION RUN/START CIRCUIT
1. Turn the ignition off.
2. Disconnect the Coolant Three Way Valve harness connector.
3. Turn the ignition on, engine not running.
4. Measure the voltage on the (F947) Fused Ignition Run/Start circuit at the Coolant Three Way Valve harness connector.
  Is the voltage approximately equal to battery voltage?
  
  Yes
  - Go To 4
  No
  - Repair the (F947) Fused Ignition Run/Start circuit for a an open circuit or short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
CHECK THE (Z908) GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Turn the ignition off.
2. Measure the resistance between ground and the (Z908) Ground circuit at the Coolant Three Way Valve harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the (Z908) Ground circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
COOLANT THREE WAY VALVE
1. Replace the Coolant Three Way Valve if no problems were found in the connector.
2. Turn the ignition on.
3. With the scan tool, navigate to Misc Functions, and select the Coolant Three Way Valve Replaced selection to clear the Coolant Three Way Valve actuation counter.
4. With the scan tool, navigate to System Test and select the Coolant Three Way Valve Test.
  Did the Coolant Valve Three Way Valve Test pass or fail?
  
  Pass
  - Repair is complete.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  Fail
  - Go To 6
CHECK RELATED PCM AND COMPONENT CONNECTIONS
1. Perform any Service Bulletins that apply.
2. Disconnect all PCM harness connectors.
3. Disconnect all related in-line harness connections (if equipped).
4. Disconnect the related component harness connectors.
5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Check for spread terminals and verify proper terminal tension.
  Repair any conditions that are found.
6. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
9. With the scan tool, erase DTCs.
10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
11. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Powertrain Control Module in accordance with the Service information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  - Test complete.