Air Regulator Specifications/Testing (SB90-03-003)

AIR REGULATOR SPECIFICATIONS/TESTING

TECHNICAL SERVICE BULLETIN

AIR REGULATOR TEST PROCEDURE

Models: All Isuzu

Bulletin No.: SB90-03-003

Group: Emissions

Date: January 25, 1990

AFFECTED VEHICLES

All Isuzu models with fuel-injected four -cylinder engine.

SERVICE INFORMATION

This Service Bulletin contains the correct testing procedure for the air regulator.

When Fast Idle Speed In Not Obtained: 

1. Disconnect the air regulator harness at the connector.
2. Measure the resistance across the air regulator terminals.
   AIR REGULATOR SPECIFICATIONS
   
   

   Models	Trans./Procedure Date	Standard Resistance
   Impulse (JR)	M/T 5/87 and before	38-42
   Impulse (JR)	A/T 9/83 and before	38-42
   Impulse (JR)	M/T 5/87 And later	48-52
   Impulse (JR)	A/T 9/83 and later	48-52
   Trooper II (KT)	All models 7/87 to 8/87	38-42
   Trooper II (KT)	All models 8/87 and later	45-50
   Pickup (TF) and
   Amigo (TC)	All models	45-50

   If the measured resistance is not within the specified range, replace the air regulator assembly.

3. Start the engine and check for presence of voltage at the connector.
   • If voltage is not present, check the wiring harness leading to the air regulator and correct if necessary.
   • If voltage is present, replace the air regulator assembly.
4. Reconnect air regulator harness.