A/C Cutoff System; A/C Signal; Control System; Powertrain Control Module (Pcm) Removal/Installation/Inspection - Mazda B-Series 1997 Workshop Manual

A/C CUTOFF SYSTEM (FOR 2.3L 13.OL / 4.OL)
DESCRIPTION
An N C cutoff system is used to improve idle smoothness immediately after starting the engine and to
improve acceleration and performance.
A/C Signal
If the A/C is on during the diagnostic trouble code check, Dlagnostic Trouble Code No. P I 464 is output.
If the circuit is open, wide open throttle N C cutoff will not occur.
If the circuit is shorted, the N C will not operate.
~BUOFT-223
Wide Open Throttle A/C Cutoff Relay (WAC)
If the wide open throttle A/C cutoff relay circuit has an open or short, or A/C was on during self-test,
Diagnostic Trouble Code No. PI460 is output.
If the circuit is open, A/C cutoff will not occur.
If the circuit is shorted, A/C will not operate.
~BUOFT-224
Operation
CONTROL SYSTEM (FOR 2.3L 13.OL 14.OL)
Engine condition
Immediately after engine starts
Throttle valve fully open
Overheating
PREPARATION
SST
Purpose
Improved idle
Improved driveability
- -
Prevent engine from overheating
5-7 N-m {51-71 KgCcm, 44-62 in-lbf)
POWERTRAIN CONTROL MODULE (PCM)
Removal 1 Installation
1. Disconnect the negative battery cable.
2. Disconnect the powertrain control module connector.
3. Remove the two nuts and remove the powertrain control
module.
4. Reverse the removal procedure to install.
4131.~0~3-182
Inspection
1. Disconnect the PCM connector.
2. Connect the SST (1 04 pin breakout box) between vehicle
harness and PCM.
3. Measure the voltage at each terminal with a voltmeter.
For 2.3L: Refer to pages FT-177 through FT-181
For 3.OL: Refer to pages FT-171 through FT-175
For 4.OL: Refer to pages FT-165 through FT-169
4. If any PCM terminal voltage is incorrect, check the related
input or output devices and wiring. If no problem is found,
replace the PCM. (Refer to above.)
Note
You can also inspect any PID values through scan
tool or SST (NGS). To obtain PID(s) through NGS,
refer to page FT-74.