Test VAF - Vane Airflow Meter

NOTE: Enter this test only when a Code 08 is displayed during SELF-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.

Fig 1: Identifying VAF Meter Connector Terminals

CIRCUIT PIN IDENTIFICATION

Circuit	Breakout Box Pin	ECA Pin
1.8L
SIGRTN	46, 49	2D
VAF	25	2O
VREF	26	2K
2.2L (Non-Turbo MTX)
SIGRTN	46, 49	2D
VAF	25	2O
VMREF	6	2J
VPWR	37, 57	1B
2.2L (All Others)
SIGRTN	46, 49	3D
VAF	25	2B
VMREF	6	2A
VPWR	37, 57	1B

1) Checking System Integrity Visually check all wiring, connectors and components for evidence of damage, shorting or looseness. If a fault is found, repair as necessary. If no fault is found, go to step 2).

2) Checking VAF Meter Voltage Install breakout box. Turn ignition on. Measure voltage between VAF and SIGRTN test pins while moving air door. Voltage should be as listed in VOLTAGE SPECIFICATIONS (VAF METER) . If voltage is not as specified, go to step 4). On 1.8L engines, if voltage is as specified, VAF meter and circuit are okay. Fault is in another circuit or in ECA.

3) On 2.2L engines, if voltage is as specified, measure voltage between VMREF and SIGRTN test pins. If voltage is 7-9 volts, VAF and circuit are okay; fault is in another circuit or ECA. If voltage is not 7-9 volts, repair VMREF circuit between ECA and VAF meter.

VOLTAGE SPECIFICATIONS

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
Fully Open	7.87

4) Checking Signal From VAF Meter Locate VAF meter measuring vane and remove connector. On 1.8L engines, jumper SIGRTN and VREF connector terminals to matching terminals on VAF meter. On 2.2L engines, jumper SIGRTN, VMREF and VPWR connector terminals to matching terminals on VAF meter. Leave VAF circuit open. Turn ignition on. Measure voltage between VAF terminal at meter and SIGRTN terminal at harness connector while moving air door. Voltage should be as listed in VOLTAGE SPECIFICATIONS (VAF METER) . On 1.8L engines, if voltage is not as specified, go to next step. On 2.2L engines, If voltage is as specified, go to step 6). On all models, if voltage is as specified repair VAF circuit between ECA and VAF meter.

5) 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 voltage is not 4.5-5.5 volts, go to CIRCUIT TEST VREF.

6) VAF Signal Without VMREF Locate air door of VAF meter. Turn ignition off. Remove meter connector. Using jumper wire, attach SIGRTN and VPWR connector terminals to matching terminals of VAF meter. Leave VAF and VMREF circuits open. Turn ignition on. Measure voltage between VAF terminal and SIGRTN terminal on VAF meter. As flap is moved, voltage should be as listed in VOLTAGE SPECIFICATIONS (VAF METER) . If voltage is as specified, repair VMREF circuit between ECA and VAF meter. If voltage is not as specified, go to step 7).

7) SIGRTN/VPWR At VAF Meter Remove VAF meter connector. Turn ignition on. Measure voltage between VPWR terminal and SIGRTN terminal at connector. If voltage is greater than 10 volts, replace VAF meter. If voltage is less than 10 volts, measure voltage between VPWR terminal and ground. If voltage is more than 10 volts, repair SIGRTN wire between VAF meter and ECA. If voltage is less than 10 volts, go to CIRCUIT TEST VPWR.