Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
PCM Harness Resistance
Turn ignition switch to LOCK position. Disconnect PCM and appropriate component harness connectors. Check for open or short circuits between PCM harness connector terminal and component harness connector terminal. See POWERTRAIN CONTROL MODULE (PCM) CONNECTOR I.D. table. See WIRING DIAGRAMS article. If harness is open or shorted, repair as necessary.
| Terminal | Wire Color | Function | ||
|---|---|---|---|---|
| 1 | BRN/WHT | HO2S Heater Control (Rear) | ||
| 2 | BRN/BLU | IAC Valve Control (Close) | ||
| 3 | BRN/YEL | Fuel Injector 1 Control | ||
| 4 | BRN/BLU | Fuel Injector 3 Control | ||
| 5 | BRN/BLK | Fuel Injector 5 Control | ||
| 6 | BLK | ECM Ground | ||
| 7 | BRN/GRN | Intake Resonance Switchover Solenoid Valve Control | ||
| 8 | BRN/BLU | Malfunction Indicator Lamp MIL) Control | ||
| 9-11 | ***** | Not Used | ||
| 12 | BLK/BLU | A/C Load Signal | ||
| 13-14 | ***** | Not Used | ||
| 15 | BLK/WHT | A/C Request Signal | ||
| 16 | BLU/RED | IAT Sensor Signal | ||
| 17 | BLU/GRN | MAF Sensor Signal | ||
| 18 | BRN/BLU | HO2S Signal B2S1 | ||
| 19 | BRN/BLU | HO2S Signal B1S1 | ||
| 20 | GRY/RED | CKP Sensor Ground | ||
| 21 | BRN/GRN | Transmission Torque Reduction Request Circuit | ||
| 22-25 | ***** | Not Used | ||
| 26 | RED/BRN | Battery Voltage | ||
| 27 | BRN/GRY | Engine Controls Power Relay Control | ||
| 28 | BLK | ECM Ground | ||
| 29 | BRN/RED | IAC Valve Control (Open) | ||
| 30 | BRN/WHT | HO2S Heater Control (Front) | ||
| 31 | BRN/GRN | Fuel Injector 2 Control | ||
| 32 | BRN/RED | Fuel Injector 4 Control | ||
| 33 | BRN/PPL | Fuel Injector 6 Control | ||
| 34 | BLK | ECM Ground | ||
| 35 | BRN/GRN | Intake Plenum Switchover Solenoid | ||
| 36 | BRN/PPL | A/C Relay Control | ||
| 37 | WHT | AIR Pump Relay Control | ||
| 38 | GRY/RED/BLK | CMP Sensor Signal | ||
| 39 | RED/BLK | MIL Request | ||
| 40 | BRN/WHT | Knock Sensor (KS) B2 | ||
| 41-43 | ***** | Not Used | ||
| 44 | BRN/BLU | Throttle Position (TP) Sensor Signal | ||
| 45 | BRN/LT GRN | Mass Air Flow (MAF) Sensor Signal Return | ||
| 46 | BRN/GRN | H02S Ground | ||
| 47 | ***** | Not Used | ||
| 48 | GRY | Traction Control Torque Reduction Request | ||
| 49 | GRY/BLK | Ignition Control (IC) 1-4 | ||
| 50 | BLK/YEL | Ignition Control (IC) 2-5 | ||
| 51 | BLK/RED | Ignition Control (IC) 3-6 | ||
| 52 | ***** | Not Used | ||
| 53 | BLU/BLK | 5 Volt Reference | ||
| 54 | RED/BLU | Switched Battery Voltage | ||
| 55 | BLK | ECM Ground | ||
| 56 | BRN | ECM Ignition Feed | ||
| 57-60 | ***** | Not Used | ||
| 61 | BRN/RED | EVAP Canister Purge Valve Control | ||
| 62 | PPL | AIR Cut-Off Solenoid Valve Control | ||
| 63 | BRN | Fuel Pump Relay Control | ||
| 64 | ***** | Not Used | ||
| 65 | BRN/BLK | EVAP Canister Vent Valve Control | ||
| 66-67 | ***** | Not Used | ||
| 68 | ***** | Traction Control Input/PWM Interface | ||
| 69 | BLK/RED | P/N Signal | ||
| 70 | BRN/WHT | Knock Sensor (KS) B1 | ||
| 71 | BLU/GRN | 5 V Reference Ground | ||
| 72 | BRN/YEL | EVAP Fuel Tank Pressure Sensor Signal | ||
| 73 | BLU/BLK | EVAP Fuel Tank Level Sensor Signal | ||
| 74 | BRN/BLU | Engine Coolant Temperature ECT) Sensor Signal | ||
| 75 | ***** | Not Used | ||
| 76 | BRN/BLU | H02S Signal B2 S2 | ||
| 77 | BRN/BLU | H02S Signal B1 S2 | ||
| 78 | GRN/WHT | CKP Sensor Signal | ||
| 79 | BLU/RED | Vehicle Speed/Theft Deterrent Signal | ||
| 80 | GRN | Engine Speed Output | ||
| 81 | ***** | Not Used | ||
| 82 | BRN/YEL | ECM Data Output | ||
| 83 | GRY | Engine Torque Output | ||
| 84-87 | ***** | Not Used | ||
| 88 | BRN/WHT | Serial Data | ||
|
||||
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.