Mazda MX-6 1998, Workshop Manual

Page: 639 / 1282

TROUBLESHOOTING
11
TCS indicator light and/or TCS OFF light has illuminated in the past (Now they don’t)
[TROUBLESHOOTING HINTS]
• Poor harness of TCS indicator light, TCS OFF light, or TCS OFF switch
• Communication error between TCS CM and PCM, or past malfunction of engine control system
STEP
INSPECTION
ACTION
1 Perform PCM on-board diagnostic inspection.
Is DTC displayed? Yes
Repair as specified by the applicable DTC.
No Go to next step.
2 Perform ABS/TCS on-board diagnostic
inspection.
Are any diagnostic trouble codes displayed?
Yes Repair as specified by the applicable DTC.
No Go to next step.
3 Inspect TCS OFF switch and the related
harnesses in the following area:
From ABS/TCS CM to TCS OFF light and
from ABS/TCS CM to TCS indicator light
(No shorted GND.)
Yes
System is normal.
Recheck custom er’s complaint.
No Repair or replace harness.
C a u tio n
• R e c h e c k th e d ia g n o s tic tro u b le c o d e a fte r re p a ir c o m p le tio n .
N o te
• When the engine coolant temperature is below
0 °C {3 2
°F}, the TCS OFF light stays on until the engine
warms up to the normal operating temperature (m a x . a p p ro x . 15 m in .). If the light goes off after warming
up, the system is normal.
• The TCS OFF light illuminates at key on engine off. Start engine and inspect again.
• If any symptoms have occurred in the past but are now okay, malfunction of related harness could be the
possible cause and thus ABS CM is normal.
12 TCS is not working sufficiently
[TROUBLESHOOTING HINTS]
• Improper tire size and tire air pressure
• Malfunction of PCM
• Malfunction of ABS/TCS
system
STEP INSPECTION ACTION
1
Are tire size and pressure as specified? Yes Go to next step.
No Replace the tire with specified one, or adjust the pressure.
2 Perform on-board diagnostic inspection for the
PCM.
Are DTCs indicated?
Yes Repair as specified by the applicable DTC for the PCM.
No Go to next step.
3 Connect the NGS tester to the connector,
select ACTIVE COMMAND MODES and input
0 N-m ENG TQR. Increase the engine speed
between 2,000 and 3,000 rpm.
Does engine speed decrease?
Yes System is normal.
Recheck customer’s complaint.
No Replace ABS/TCS CM.
C a u tio n
• R e c h e c k th e d ia g n o s tic tro u b le c o d e a fte r re p a ir c o m p le tio n .
N o te
• When there is a possibility of engine stalling, TCS may allow spinning and restrain the torque reduction
amount in order to prevent the engine from stalling.
• If any symptoms have occurred in the past but are now okay, poor harness could be the possible cause
and thus ABS CM is normal.
0 4 -0 1 -2 0