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Engine Controls - Tests W/codes - 3.5L: Overview Chrysler LHS I

Testing & Diagnostics ~1029 words

MODEL IDENTIFICATION

Model and engine combinations identified in MODEL IDENTIFICATION table are equipped with On-Board Diagnostics-I (OBD-I).

ModelBody Code
Concorde, Intrepid, LHS, New Yorker & VisionLH

MODEL IDENTIFICATION

CHECKING COOLANT SENSOR CALIBRATION & RADIATOR FAN OPERATION

Note. After each repair, perform TEST VER-2 .

  1. Start engine. Allow engine to reach normal operating temperature. Using scan tool, read Engine Coolant Temperature (ECT) sensor value. If ECT sensor value does not increase smoothly, replace ECT sensor. If ECT sensor value increases smoothly, go to next step.
  2. If coolant temperature reaches 180°F (82°C) or more, replace ECT sensor. If coolant temperature does not reach 180°F (82°C) or more, go to next step.
  3. Run engine until radiator fan operates or temperature reaches 220°F (104°C). If cooling fan does not operate, repair cooling fan as necessary. See SPECIFICATIONS & ELECTRIC COOLING FANS article in ENGINE COOLING. If cooling fan operates, test is complete.

CHECKING SOLENOID OPERATIONS

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION. For wiring diagram, see WIRING DIAGRAMS - 3.5L article in ENGINE PERFORMANCE. After each repair, perform TEST VER-2 .

  1. Using scan tool, actuate purge solenoid. While touching top of canister purge solenoid, feel for operation. If purge solenoid does not operate, replace canister purge solenoid. If purge solenoid operates, go to next step.
  2. Actuate EGR solenoid. While touching top of EGR valve, feel for operation. If EGR solenoid does not operate, replace EGR solenoid. If EGR solenoid operates, go to next step.
  3. If vehicle is equipped with a 3.3L engine and solenoids are operating normally, test is complete. If vehicle is equipped with a 3.5L engine, go to next step.
  4. Using scan tool, actuate Manifold Tuning Valve (MTV) solenoid. While touching top of MTV solenoid, feel for operation. MTV solenoid is located on right front strut tower. If MTV solenoid does not operate, replace MTV solenoid. If MTV solenoid operates, go to next step.
  5. Start engine and let idle for one minute to build up vacuum. Turn engine off. Turn ignition on. Actuate MTV valve. If MTV valve opens and closes fully when actuated, MTV solenoid and valve are operating properly. Test is complete. If MTV valve does not open and close fully when actuated, go to next step.
  6. Inspect MTV valve vacuum hose for leaks. Repair as required. If no vacuum leaks are observed, replace MTV valve.

INSPECTING IDLE AIR CONTROL MOTOR OPERATION

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION. For wiring diagram, see WIRING DIAGRAMS - 3.5L article in ENGINE PERFORMANCE. After each repair, perform TEST VER-1 .

  1. Disconnect Idle Air Control (IAC) motor connector. Turn ignition on. Using scan tool, actuate IAC motor. Using scan tool in voltmeter mode, check voltage on IAC motor connector terminal No. 1 (Gray/Red wire). If voltage is less than one volt, go to TEST NS-7B. If voltage is more than one volt, go to next step.
  2. Check voltage on IAC motor connector terminal No. 3 (Brown/White wire). If voltage is less than one volt, go to «TEST NS-7C»(ref-11020-S17381126292000111000000) . If voltage is more than one volt, go to next step.
  3. Check voltage on IAC motor connector terminal No. 4 (Violet/Black wire). If voltage is less than one volt, go to «TEST NS-7D»(ref-11020-S03217470762000111000000) . If voltage is more than one volt, go to next step.
  4. Check voltage on IAC motor connector terminal No. 2 (Yellow/Black wire). If voltage is less than one volt, go to «TEST NS-7E»(ref-11020-S23981884392000111000000) . If voltage is more than one volt, turn ignition off. Go to next step.
  5. Remove IAC motor from throttle body. Reconnect IAC motor connector. Using scan tool, actuate IAC motor connector. If IAC motor tip moves in and out, go to «TEST NS-8A»(ref-11020-S41988560382000111000000) . If IAC motor tip does not move in and out, replace IAC motor.

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION. For wiring diagram, see WIRING DIAGRAMS - 3.5L article in ENGINE PERFORMANCE. After each repair, perform TEST VER-1 .

  1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. PCM is located under air cleaner. Inspect all terminals. Repair as required. If PCM terminals are okay, go to next step.
  2. Using an external ohmmeter, check resistance of Gray/Red wire between IAC motor connector terminal No. 1 and PCM connector terminal No. 39. If resistance is less than 5 ohms, replace PCM. If resistance is more than 5 ohms, repair open Gray/Red wire.

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION. For wiring diagram, see WIRING DIAGRAMS - 3.5L article in ENGINE PERFORMANCE. After each repair, perform TEST VER-1 .

  1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. PCM is located under air cleaner. Inspect all terminals. Repair as required. If PCM terminals are okay, go to next step.
  2. Using an external ohmmeter, check resistance of Brown/White wire between IAC motor connector terminal No. 3 and PCM connector terminal No. 40. If resistance is less than 5 ohms, replace PCM. If resistance is more than 5 ohms, repair open Brown/White wire.

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION. For wiring diagram, see WIRING DIAGRAMS - 3.5L article in ENGINE PERFORMANCE. After each repair, perform TEST VER-1 .

  1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. PCM is located under air cleaner. Inspect all terminals. Repair as required. If PCM terminals are okay, go to next step.
  2. Using an external ohmmeter, check resistance of Violet/Black wire between IAC motor connector terminal No. 4 and PCM connector terminal No. 59. If resistance is less than 5 ohms, replace PCM. If resistance is more than 5 ohms, repair open Violet/Black wire.

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION. For wiring diagram, see WIRING DIAGRAMS - 3.5L article in ENGINE PERFORMANCE. After each repair, perform TEST VER-1 .

  1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. PCM is located under air cleaner. Inspect all terminals. Repair as required. If PCM terminals are okay, go to next step.
  2. Using an external ohmmeter, check resistance of Yellow/Black wire between IAC motor connector terminal No. 2 and PCM connector terminal No. 60. If resistance is less than 5 ohms, replace PCM. If resistance is more than 5 ohms, repair open Yellow/Black wire.

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