INTRODUCTION
Before testing individual components or systems, perform procedures in BASIC TESTING article. Since many computer controlled and monitored components set a fault message if they malfunction, also perform procedures in TESTS W/CODES article.
Note. Testing of individual components does not isolate possible shorts or opens in wiring harness of electronically controlled systems. Perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance unless otherwise instructed in procedure. Use an ohmmeter to isolate wiring harness shorts or opens.
POWERTRAIN CONTROL MODULE (PCM)
The PCM power and ground circuits may be checked by performing TEST NTC-3A in TESTS W/CODES article. For PCM location, see PCM LOCATION table.
| Application | Location |
|---|---|
| Dakota & Durango | Right Front Fender, Near Firewall |
| Ram Pickup & Ram Van/Wagon | On Firewall, Near Wiper Motor |
PCM LOCATION
Camshaft Position (CMP) Sensor
See TEST TC-1A in TESTS W/CODES article.
Crankshaft Position (CKP) Sensor
See TEST TC-40A in TESTS W/CODES article.
Engine Coolant Temperature (ECT) Sensor
See TEST TC-30A and TC-31A in TESTS W/CODES article.
Heated Oxygen Sensor (HO2S)
See appropriate Trouble Code (TC) TEST in TESTS W/CODES article.
Intake Air Temperature (IAT) Sensor
See TEST TC-57A and TC-58A in TESTS W/CODES article.
Manifold Absolute Pressure (MAP) Sensor
See TEST TC-36A and TC-37A in TESTS W/CODES article.
Transmission Temperature (TRANS Temp) Sensor
See TEST TC-74A and TC-75A in TESTS W/CODES article.
Throttle Position (TP) Sensor
See TEST TC-26A and TC-27A in TESTS W/CODES article.
Vehicle Speed Sensor (VSS)
See TEST TC-15A, TC-82A and TC-87A in TESTS W/CODES article.
Evaporative (EVAP) Purge Solenoid
See TEST TC-18A in TESTS W/CODES article.
Leak Detection Pump (LDP) Solenoid
See TEST TC-183A in TESTS W/CODES article.
Speed Control (S/C) Solenoid
See TEST TC-12A in TESTS W/CODES article.
Transmission Governor Pressure Solenoid
See TEST TC-171A in TESTS W/CODES article.
Transmission 3-4 Solenoid
See TEST TC-50A in TESTS W/CODES article.
Leak Detection Pump (LDP) Switch
See TEST TC-184A in TESTS W/CODES article.
Park/Neutral (P/N) Switch
See TEST TC-114A in TESTS W/CODES article.
Power Steering (PS) Switch
See TEST TC-115A in TESTS W/CODES article.
Speed Control Switch
See TEST TC-87A in TESTS W/CODES article.
A/C Clutch Relay
See TEST TC-16A in TESTS W/CODES article.
Auto Shutdown (ASD) Relay
See TEST TC-10A in TESTS W/CODES article.
Fuel Pump Relay
See TEST TC-101A in TESTS W/CODES article.
Radiator Fan Control Relay
See TEST TC-14A in TESTS W/CODES article.
Torque Converter Clutch (TCC) Relay
See TEST TC-12A in TESTS W/CODES article.
Transmission Governor Pressure Solenoid Relay
See TEST TC-171A in TESTS W/CODES article.
Transmission Relay
See TEST TC-50A in TESTS W/CODES article.
Transmission 12-Volt Supply Relay
See TEST TC-173A in TESTS W/CODES article.
Vehicle Speed Control Relay
See TEST TC-82A in TESTS W/CODES article.
FUEL DELIVERY
Note. For fuel system pressure testing, see BASIC TESTING article.
Fuel Injector
See TEST TC-21A in TESTS W/CODES article.
IDLE AIR CONTROL (IAC) MOTOR
See TEST TC-25A in TESTS W/CODES article.
IGNITION SYSTEM
Note. For basic ignition checks, see TEST NTC-2A in TESTS W/CODES article.
EMISSION SYSTEMS & SUB-SYSTEMS
Note. To locate emission components, refer to emission control information label in engine compartment.
No Air Supply
- Start engine, and raise engine speed to 1500 RPM. Check air supply at rubber hoses. If air supply increases with RPM, air pump operation is okay.
- If air pump is okay, check for leakage at hoses and fittings. Repair or replace hoses as necessary.
- If hoses are okay, check pressure relief valve for leakage. If air is expelled through pressure relief valve at idle, replace relief valve.
- If relief valve is okay, test is complete.
EGR Valve
See TEST TC-140A in TESTS W/CODES article.
EVAP Canister
EVAP canister is located in engine compartment. Canister has no moving parts. Check for loose, missing, cracked or broken connections and parts. Repair or replace as necessary. No liquid should be in canister.
LDP
See appropriate Trouble Code (TC) TEST in TESTS W/CODES article.
PCV Valve
- With engine running at curb idle, remove PCV valve from grommet. If valve is functioning properly, a hissing sound will be heard as air passes through valve.
- With engine running, place finger over valve inlet. Strong vacuum should be felt at valve inlet. Stop engine. Remove and shake PCV valve to ensure a metallic clicking noise can be heard, indicating valve is free. Reinstall PCV valve.
- Remove crankcase ventilation filter or oil filler cap from valve cover. Hold a piece of stiff paper over opening. After allowing about one minute for crankcase pressure stabilization, paper should be drawn against opening.
- If paper is held against opening, performance is okay. If paper is not held against opening, replace PCV valve and retest. If performance does not improve, inspect system for restrictions and clean as necessary.
MISCELLANEOUS CONTROLS
Note. Although the controlled devices listed here are not technically engine performance components, they can affect driveability if they malfunction.
See A/C CLUTCH RELAY under RELAYS.
See RADIATOR FAN CONTROL RELAY under RELAYS.
See TORQUE CONVERTER CLUTCH (TCC) RELAY under RELAYS.
See TRANSMISSION GOVERNOR PRESSURE SOLENOID RELAY under RELAYS.
See TRANSMISSION RELAY under RELAYS.
See TRANSMISSION 12-VOLT SUPPLY RELAY under RELAYS.
See VEHICLE SPEED CONTROL RELAY under RELAYS.