BF135A•BF150A
5-82
-2. Check for the continuity between the IAC valve No. 2
terminal and the body ground.
Is there the continuity?
YES –
Replace the IAC valve.
NO –
Perform "4. IAC valve line open circuit check".
4. IAC valve line open circuit check
-1. Connect the IAC valve 2P connector.
-2. Disconnect the ECM connector B.
-3. Measure the resistance between the test harness B-26
terminal and the B-34 terminal.
Is the resistance 10 – 13
?
YES –
Perform "5. IAC valve line short circuit check".
NO –
Check for open in the wire between the ECM
and the IAC valve.
5. IAC valve line short circuit check
-1. Check for the continuity between the test harness B-26
terminal and the engine ground, and between the B-34
terminal and the engine ground.
Is there the continuity?
YES –
Repair short in the wire between the ECM
and the IAC valve.
NO –
Substitute a known-good ECM and recheck.
• VTEC Solenoid Valve Troubleshooting
MIL blinks 21 times
1. Spool solenoid valve check
-1. Turn the ignition switch OFF and disconnect the spool
solenoid valve connector.
-2. Measure the resistance between the spool solenoid
valve side 1P connector terminal (Green/White) and
the body ground.
Is the measured resistance 12 – 18
?
YES –
Perform "2. VTEC signal line short circuit
check".
NO –
Replace the spool solenoid valve.
2. VTEC signal line short circuit check
-1. Turn the ignition switch OFF and connect the test har-
ness.
Hold the ECM connector A disconnected.
-2. Check for the continuity between the test harness A-20
terminal and the engine ground.
Is there the continuity?
YES –
Repair short in the wire between the ECM
and the spool solenoid valve.
NO –
Perform “3. VTEC signal line open circuit
check”.
IAC VALVE SIDE
2P CONNECTOR
VIEWED FROM THE TERMINAL SIDE
SPOOL SOLENOID VALVE
SIDE 1P CONNECTOR
VIEWED FROM THE TERMINAL SIDE
B-26
B-34
A-20
B-26
B-34