Mazda MX-6 1998, Workshop Manual

Page: 766 / 1282

TROUBLESHOOTING [GF4A-EL]
DTC P1780 O/D OFF switch circuit malfunction (Open, short)
DESCRIPTION
• Damaged wiring or connectors between O/D OFF switch and powertrain control module
• Short or open circuit in O/D OFF switch
• Short or open circuit in powertrain control module internal transistors
POSSIBLE
CAUSE
• Damaged wiring or connectors between O/D OFF switch and powertrain control module
• Short or open circuit in O/D OFF switch
• Short or open circuit in powertrain control module internal transistors
STEP
INSPECTION ACTION
1 Are powertrain control module and O/D OFF
switch connections at connector and connector
pins okay?
Yes
Go to next step
No Repair or replace connector(s), then go to step 6
2 Check NGS tester display
• Connect NGS tester to data link connector
•
Are O/D OFF switch operation and NGS tester
display correct?
c r 0 1 -40B POWERTRAIN CONTROL
MODULE (PCM) INSPECTION [KL]
Yes
Go to step 5
No Go to next step
3
Check for continuity between terminals of O/D
OFF switch and powertrain control module
• Disconnect negative battery cable
• Disconnect solenoid connector and powertrain
control module connector
• Is there continuity between terminals?
Yes Go to next step
No Repair or replace connectors and wiring, then go to step 6
4 Measure resistance at O/D OFF switch terminal
• Disconnect negative battery cable
• Disconnect O/D OFF switch
• Is resistance correct?
cr 0 5 -1 7B O/D OFF SWITCH INSPECTION
[GF4A-EL]
Yes Go to next step
No Replace O/D OFF switch, then go to step 6
o - 0 5 -1 7B O/D OFF SWITCH
REMOVAL/INSTALLATION [GF4A-EL]
5
After diagnostic trouble code has been cleared,
recheck if diagnostic trouble code is shown
c r 0 1 -0 1 B ENGINE ON-BOARD DIAGNOSIS
(KL]
Yes Return to step 2
No Problem is a temporary poor connection of wiring or
connectors, and should be investigated further, then go to
next step
6 Erase diagnostic trouble code from memory. Can
code be output after performing “After Repair
Procedure”?
Yes
Go to appropriate inspection procedure
No Finished
AUTOMATIC TRANSAXLE BASIC INSPECTION [GF4A-EL]
W 6 U 5 0 1 W 0 7
STEP
INSPECTION ACTION
1
Turn ignition switch to ON
Does O/D OFF indicator light (illuminate/go
out) correspond to O/D OFF switch position
(ON/OFF)?
Yes
Go to next step
No Perform malfunction diagnosis according to No.26 “O/D
OFF INDICATOR LIGHT DOES NOT ILLUMINATE WHEN
O/D OFF SWITCH IS TURNED ON”, or No.27 “O/D OFF
INDICATOR LIGHT ILLUMINATES WHEN O/D OFF
SWITCH IS NOT TURNED ON"
2 Check the ATF color and condition
et
0 5 -1 7B AUTOMATIC TRANSAXLE
FLUID (ATF) INSPECTION [GF4A-EL]
Are ATF color and odor normal?
Yes
Go to next step
No
Repair or replace any defective parts
3 Perform the line pressure test
c r 0 5 -1 7B MECHANICAL SYSTEM TEST
[GF4A-EL], Line Pressure Test
Is line pressure okay?
Yes Go to next step
No Repair or replace any defective parts
4 Perform the stall test
p* 05-17B MECHANICAL SYSTEM TEST
[GF4A-EL], Stall Test
Is stall speed okay?
Yes Go to next step
No Repair or replace any defective parts
0 5 -0 1 B -2 0