Test B2 - Vane Airflow (VAF) Meter

Fig 1: VAF Meter Circuits

CIRCUIT PIN IDENTIFICATION

Circuit	Breakout Box Pin	ECA Pin
2.2L MTX Non-Turbo
SIGRTN	46, 49	2D
VAF	25	2O
VMREF	6	2J
VPWR	37, 57	1B
2.2L Except MTX Non-Turbo
SIGRTN	46, 49	3D
VAF	25	2B
VMREF	6	2A
VPWR	37, 57	1B

NOTE: Enter this test only when a Code 08 is displayed during the QUICK TEST procedure or when directed here from another CIRCUIT TEST. To avoid unnecessary use of diagnostic time, check for unmetered air leaks between VAF meter and throttle body. This test is intended to diagnose only VAF and VMREF circuits.

1) Checking System Integrity Visually check all wiring, harnesses, connectors and components for evidence of damage, overheating, shorting or looseness. If a fault is found, repair as necessary. If no faults are found, go to next step.

2) Checking VAF Meter Voltage Install breakout box. Turn key on. Measure voltage between VAF and SIGRTN test pins. Voltage should be as listed in VAF METER VOLTAGE VALUES . If not, go to step 3. If voltage is correct, measure voltage between VMREF and SIGRTN test pins. If voltage is 7-9 volts, circuit is okay. Fault is in another circuit or ECA. If voltage is not 7-9 volts, repair VMREF circuit between ECA and VAF meter.

VAF METER VOLTAGE VALUES

Door Position	Volts
1/8 Open	3.24
1/4 Open	5.60
3/8 Open	5.62
1/2 Open	5.83
5/8 Open	6.02
3/4 Open	6.57
7/8 Open	7.46
Full Open	7.87

3) Checking Signal From VAF Meter Locate VAF meter measuring vane and remove connector. Connect SIGRTN, VMREF and VPWR to VAF using jumper wire. Leave VAF circuit open. Turn ignition on. Measure voltage between terminal VAF terminal and SIGRTN terminal. Voltage should be as listed in VAF METER VOLTAGE VALUES . If not, go to step 4. If voltage is correct, repair VAF circuit between ECA and VAF meter.

4) Checking VREF At VAF Meter Turn ignition off. Remove VAF meter connector. Turn ignition on. Measure voltage between VAF wire and SIGRTN wire. If voltage is 4.5-5.5 volts replace VAF meter. If not, go to TEST A7.

5) VAF Signal Without VMREF Locate VAF meter air door. Turn ignition off. Remove meter connector. Using jumper wire, attach SIGRTN and VPWR connector terminals to VAF meter. Leave VAF and VMREF circuits open. Turn ignition on. Measure voltage between VAF terminal and SIGRTN terminal on VAF meter. Voltage should be as listed in VAF METER VOLTAGE VALUES as flap is moved. If voltage is correct, repair VMREF circuit between ECA and VAF meter. If not, go to step 6.

6) SIGRTN/VPWR At VAF Meter Remove VAF meter connector. Turn ignition on. Measure voltage between VPWR terminal and SIGRTN terminal at VAF meter. If voltage is greater than 10 volts replace VAF meter. If voltage is less than 10 volts, go to TEST A7.