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1993 B2200 & B2600i Mass Air Flow (MAF) Diagnostic Test

     
Mass Air Flow Sensor

1) Pull rubber boot back from airflow sensor connector. Backprobe sensor connector, and check terminal voltages. See Fig. 1. See AIRFLOW SENSOR TERMINAL VOLTAGES table.

2) If voltages are not correct, check wiring for open or short. If wiring is okay, check burn-off operation. See BURN-OFF OPERATION procedure. If ECU control of burn-off operation is okay but voltages are still incorrect, replace airflow sensor.

AIRFLOW SENSOR TERMINAL VOLTAGES TABLE

     
     
Terminal Wire

Ignition On
Volts
Engine Running
Volts
     
Black/Yellow     (Power Supply)
Green/Orange  (Burn-Off
Green/Black     (Airflow Mass)
Green/Yellow   (Ground)
Black/Orange   (Ground)
12.0
0
1.20 - 02.0
0
0
12.0
0
1.9  -  5.0
0
0
     
Figure 1
MAF Testing
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Burn-Off Operation (B2200 & B2600i)


1) Perform this test if airflow sensor failed voltage test. Disconnect negative battery cable to reset ECU. Reconnect negative battery cable.

2) Bring engine to normal operating temperature. Pull back rubber boot from airflow sensor connector. Operate engine at about 2000 RPM for 3 minutes with transmission in Neutral.

3) Turn ignition off. Backprobe airflow sensor Green/Orange wire at ECU terminal 2H using a voltmeter. Voltage should be zero volts immediately after ignition is turned off. About 8-12 volts should be present momentarily, 2-5 seconds after ignition switch is turned to OFF position.

4) If voltages are as specified, replace airflow sensor. If voltages are not as specified, check voltage and related wiring at ECU terminals 2P, 2Q and 1I (B2200 and B2600i) or ECU terminals 2O, 2Q and 1I (MPV 2.6L). See J - PIN VOLTAGE CHARTS article.