Diagnostic Aids
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 | |