Test Dc - Introduction
NOTE:
Perform this test when Code 26, 56, or 66 is displayed in the QUICK TEST or when directed here by test charts. This test procedure is intended to diagnose only the MAF, ECA and vehicle harness circuits (VPWR, PWR GND, MAF and MAF RTN).
NOTE:
To prevent replacement of good components, be aware that the following non-EEC related areas may be at fault:
- Air cleaner element
- Inlet air duct
- Throttle body
MAF SENSOR TEST PIN IDENTIFICATION (WIRE COLOR)
| Test Pin No. | Wire Color |
|---|---|
| Pin 9 or 15 | Tan/Light Blue |
| Pin 14 or 50 | Dark Blue/Orange |
| Pin 37 or 57 | Red |
| Pin 40 or 60 | Black/Light Green |
MAF SIGNAL VOLTAGE
| Application | Volts |
|---|---|
| Idle | .60 |
| 20 MPH | 1.10 |
| 40 MPH | 1.70 |
| 60 MPH | 2.10 |
NOTE:
MAF signal voltage is typical for an A/T equipped vehicle at normal operating temperature. Voltage signal may vary due to engine load and temperature.