Diagnostic Test

WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Check For An Active DTC
1. Turn The Ignition On.
2. With The Scan Tool, Record All Freeze Frame Data.
3. With The Scan Tool, Read DTCS.
  Did The DTC Return?
  
  Yes
  - Go To 2
  No
  - Perform The INTERMITTENT CONDITION Diagnostic Procedure. Refer To INTERMITTENT CONDITION .
Check The Intake Air Heater Relay Connectors For Corrosion, Damage, Or Poor Fit
1. Inspect The Intake Air Heater Relay Harness Connectors For Corrosion And Proper Fit.
  Are The Intake Air Heater Relay Harness Connectors Corroded Or Improperly Seated?
  
  Yes
  - Repair The Intake Air Heater Relay Harness Connectors As Necessary.
  - Perform The POWERTRAIN VERIFICATION TEST. Refer To POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
Check The (K174) Intake Air Heater Relay Control Circuit
CAUTION:
Excessive Actuation To The Intake Air Heater May Overheat And Damage The Heater Assembly. Allow The Intake Air Heater To Cool For Five Minutes Between Each Actuation Procedure To Prevent Any Possible Damage From Overheating To Occur To The Intake Air Heater.
1. Turn Ignition On, Engine Not Running.
2. Disconnect The (K174) Intake Air Heater Relay Control Circuit Connector At The Intake Air Heater Relay.
3. Using A Scan Tool, Actuate The Cold Start Aid Driver 1 Output Circuit.
  NOTE:
  Set The Actuation To On.
4. Using A Voltmeter, Probe The (K174) Intake Air Heater Relay Control Circuit At The Connector.
  Does The Voltmeter Read Equivalent To Battery Voltage?
  
  Yes
  - Go To 5
  No
  - Go To 4
Check The (K174) Intake Air Heater Relay Control Circuit For An Open/High Resistance
1. Turn Ignition Off.
2. Disconnect The PCM C2 Harness Connector.
3. Measure The Resistance Of The (K174) Intake Air Heater Relay Control Circuit Between The Intake Air Heater Relay And The PCM C2 Harness Connector.
  Is The Resistance Below 3.0 Ohms?
  
  Yes
  - Go To 7
  No
  - Repair The (K174) Intake Air Heater Relay Control Circuit For An Open Or High Resistance.
  - Perform The POWERTRAIN VERIFICATION TEST. Refer To POWERTRAIN VERIFICATION TEST .
Check The Intake Air Heater Relay Operation
1. Turn Ignition Off.
2. Disconnect The (K974) Intake Air Heater Relay Control Return Circuit Connector At The Intake Air Heater Relay.
3. Using A Voltmeter Connected To Battery Positive, Probe The (K974) Intake Air Heater Relay Control Return Circuit At The Connector.
  Does The Voltmeter Read Equivalent To Battery Voltage?
  
  Yes
  - Replace The Intake Air Heater Relay In Accordance With The Service Information. At This Time, Visually Inspect The Intake Grid Heater Cover Power Terminal For Deformation Of The Plastic Over-Mold And/Or Movement By Hand. If Either Of These Conditions Are Present, The Intake Grid Heater Cover Should Also Be Replaced.
  - Perform The POWERTRAIN VERIFICATION TEST. Refer To POWERTRAIN VERIFICATION TEST .
  No
  - Go To 6
Check The (K974) Intake Air Heater Relay Control Return For An Open/High Resistance
1. Disconnect The PCM C2 Harness Connector.
2. Measure The Resistance Of The (K974) Intake Air Heater Relay Control Return Circuit Between The Intake Air Heater Relay Connector And The PCM C2 Harness Connector.
  Is The Resistance Below 3.0 Ohms?
  
  Yes
  - Go To 7.
  No
  - Repair The (K974) Intake Air Heater Relay Control Return Circuit For An Open Or High Resistance.
  - Perform The POWERTRAIN VERIFICATION TEST. Refer To POWERTRAIN VERIFICATION TEST .
Check Related Harness Connections
1. Disconnect All PCM Harness Connectors.
2. Disconnect All Related In-Line Harness Connections (If Equipped).
3. Disconnect The Related Component Harness Connectors.
4. 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.
5. Connect All PCM Harness Connectors. Be Certain That All Harness Connectors Are Fully Seated And The Connector Locks Are Fully Engaged.
6. Connect All In-Line Harness Connectors (If Equipped). Be Certain That All Connectors Are Fully Seated And The Connector Locks Are Fully Engaged.
7. Connect All Related Component Harness Connectors. Be Certain That All Connectors Are Fully Seated And The Connector Locks Are Fully Engaged.
8. With The Scan Tool, Erase DTCS.
9. Test Drive Or Operate The Vehicle In Accordance With The WHEN MONITORED And SET CONDITIONs.
10. With The Scan Tool, Read DTCS.
  Did The DTC Return?
  
  Yes
  - Replace And Program The Powertrain Control Module (PCM) In Accordance With The Service Information. Refer To MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform The POWERTRAIN VERIFICATION TEST. Refer To POWERTRAIN VERIFICATION TEST .
  No
  - The Wiring Or Poor Connection Problem Has Been Repaired.
  - Perform The POWERTRAIN VERIFICATION TEST. Refer To POWERTRAIN VERIFICATION TEST .