Diagnostic Aids
WARNING: This page is about a different car, the 2002 Mercury Villager. However, it is still accessible from the selected car via links, so may be relevant.
Perform this test when instructed during QUICK TEST or another SYSTEM TEST. This test is intended to diagnose the following:
- HO2S heater.
- HO2S and sensor connection.
- Vacuum systems.
- Fuel injector and/or fuel injector circuitry.
- Harness circuits; HO2S HTR, HO2S, HO2S, INJ1-6 and VPWR.
- PCM.
NOTE:
Vehicles with Federal emissions use HO2S-11 only.
HO2S, HTR, INJ1-6 & KAPWR CIRCUIT IDENTIFICATION
| Circuit | PCM Terminal No. | Wire Color |
|---|---|---|
| HO2S-11 | 48 | Light Green |
| HO2S-12 | 54 | Brown |
| HTR-11 | 99 | Black |
| HTR-12 | 102 | Yellow |
| INJ1 | 82 | Green/Orange |
| INJ2 | 89 | Green |
| INJ3 | 84 | Green/Red |
| INJ4 | 91 | Yellow/Violet |
| INJ5 | 86 | Yellow/Green |
| INJ6 | 93 | Gray/Blue |
| KAPWR | 80 | Yellow |
HO2S OPERATING SPECIFICATIONS
| Engine Operating Condition | PID Reading | |
|---|---|---|
| KOEO | ||
| HO2S-11 | Less Than 1 Volt | |
| HO2S-12 | Less Than 1 Volt | |
| Idle | ||
| HO2S-11 | Switches Between 0.0-1.0 Volt | |
| HO2S-12 | Switches Between 0.0-1.0 Volt | |
| Deceleration | ||
| HO2S-11 | 0.0-0.4 Volt | |
| HO2S-12 | 0.0-1.0 Volt | |
| Acceleration | ||
| HO2S-11 | 0.5-1.0 Volt | |
| HO2S-12 | 0.0-1.0 Volt | |