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DTC P0201: Injector No. 1 Control Circuit: Testing

  1. Start engine and let idle for at least 20 seconds. Turn engine off. Turn ignition on. Using scan tool, retrieve DTCs. If GLOBAL GOOD TRIP displayed is equal to zero, go to next step. If GLOBAL GOOD TRIP displayed is not equal to zero, go to step  7 .
  2. Turn ignition off. Disconnect injector No. 1 harness connector. On 2.5L, it may be necessary to remove upper intake manifold to access injector. On all models, inspect harness connectors and clean/repair as necessary. Turn ignition on. Using scan tool, actuate injector No. 1. Using a 12-volt test light connected to ground, check for voltage at terminal No. 2 (Dark Green/Orange wire) at injector No. 1 harness connector. If test light is brightly illuminated, go to next step. If test light is not brightly illuminated, repair open in Dark Green/Orange wire between injector No. 1 and Automatic Shutdown (ASD) relay. ASD relay is located in power distribution center. See Figure .
  3. Turn ignition off. Using an analog voltmeter, connect positive lead to positive battery voltage. Connect negative lead to terminal No. 1 (White/Dark Blue wire) at injector No. 1 harness connector. Turn ignition on. Using scan tool, actuate injector No. 1 and observe voltmeter. If voltmeter needle does not fluctuate, go to next step. If voltmeter fluctuates, replace injector No. 1.
  4. Turn ignition off. Disconnect Powertrain Control Module (PCM) harness connectors. PCM is located to left of Power Distribution Center (PDC) in engine compartment, next to air cleaner. Inspect harness connector and clean/repair as necessary. Measure resistance between ground and terminal No. 13 (White/Dark Blue wire) at PCM harness connector C1. See Figure . If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in White/Dark Blue wire between injector No. 1 and PCM.
  5. Measure resistance in White/Dark Blue wire between terminal No. 1 at injector No. 1 harness connector and terminal No. 13 at PCM harness connector C1. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in White/Dark Blue wire between injector No. 1 and PCM.
  6. If no other potential causes are remaining, replace PCM. After replacing PCM, PCM MUST be reprogrammed. See POWERTRAIN CONTROL MODULE  under PROGRAMMING.
  7. Turn ignition off. Inspect harness connectors and wiring. If no problems exist, go to next step. If any problems exist, repair as necessary.
  8. Start engine. Wiggle wiring harness between injector No. 1 and Powertrain Control Module (PCM). PCM is located to left of Power Distribution Center (PDC) in engine compartment, next to air cleaner. If wiggling does not cause engine to miss or stall, go to next step. If wiggling caused engine to miss or stall, repair wiring harness as necessary where wiggling caused problem to appear.
  9. Using scan tool, read FREEZE FRAME data. Ensure caused by DTC (P0201) matches DTC on scan tool. Utilize FREEZE FRAME data to help in diagnostics. Condition to set DTC is not present at this time. Visually inspect related wiring harnesses and connectors. Check for broken, bent, pushed out or corroded terminals. Check for chafed, pierced or partially broken wires. Check Technical Service Bulletins (TSBs) for any pertinent information. Test is complete.
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