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Intake Air System
Intake Air Bypass (IAB) Control System (cont'd)
(From page 11-155)
Check for vacuum at 5,000 rpm:
1. Raise engine speed to above
5,000 rpm.
2. Check for vacuum at the vac-
uum hose.
Is there vacuum?
IAB control system is OK.
Table of Contents
(From page 11-155)
Is there battery voltage?
Check for an open in the wire
(IABCS line):
1. Stop the engine and turn the
ignition switch ON.
2. Connect ECM connector ter-
minals A20 to A26 with a
jumper wire.
Does the solenoid valve click
when the jumper is connected?
Substitute a known-good ECM
and recheck (see page
immobilizer information). If symp-
tom/indication goes away, replace
the original ECM.
Is there vacuum?
Check for a short in the wire
(IABCS line):
1. Turn the ignition switch OFF.
2. Disconnect the ECM connec-
tor A (26P) from the ECM.
3. Check for continuity between
the control box connector ter-
minal No. 6 and body ground.
Is there continuity to ground?
Substitute a known-good ECM
and recheck (see page
immobilizer information). If symp-
tom goes away, replace the origi-
nal ECM.
Repair open in the wire between
the control box 6P connector and
No. 5 BACK-UP LIGHTS ALTER-
NATOR TURN SIGNALS (IS A)
fuse in the under-dash fuse box.
Repair open in the wire between
ECM (A20) and control box 6P
connector.
11-39
for
Replace the IAB control solenoid
valve.
Repair short to ground at the
wire between ECM (A20) and
control box 6P connector.
11-39
for
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