Suzuki Grand Vitara JB627. Manual - part 221
5A-68 Automatic Transmission/Transaxle:
DTC Troubleshooting
Step
Action
Yes
No
1
Vehicle speed signal check
1) Check DTC in ECM and ABS control module referring to
“DTC Check in Section 1A” and “DTC Check in Section
4E”.
Is there DTC P0500: Vehicle speed sensor (VSS)
malfunction in ECM and/or DTC C1021, C1022, C1025,
C1026, C1031, C1032, C1035 and/or C1036 in ABS control
module?
Go to applicable DTC
diag. flow.
Go to Step 2.
2
Was “A/T System Check” performed?
Go to Step 3.
Go to “A/T System
Check”.
3
Do you have SUZUKI scan tool?
Go to Step 4.
Go to Step 5.
4
4L switch and its circuit check
1) Connect SUZUKI scan tool to DLC with ignition switch
OFF.
2) Turn ignition switch ON.
3) Select “DATA LIST” mode on scan tool.
4) Check 4L/N switch signal (ON or OFF) on display when
turning transfer position switch to each position.
4L/N switch specifications
“4H” position: OFF
“4L” position: ON
Is OFF / ON displayed as described above?
Intermittent trouble or
faulty TCM. Check for
intermittent trouble
referring to “Intermittent
and Poor Connection
Inspection in Section
00”. If OK, substitute a
known-good TCM and
recheck.
Go to Step 6.
5
4L/N switch and its circuit check
1) Turn ignition switch ON.
2) Check terminal voltage “E93-4” of TCM connector
connected when turning transfer position switch to each
position.
4L/N switch specifications
“4H” position: 10 – 14 V
“4L” position: 0 – 1 V
If voltage as specified?
Intermittent trouble or
faulty TCM. Check for
intermittent trouble
referring to “Intermittent
and Poor Connection
Inspection in Section
00”. If OK, substitute a
known-good TCM and
recheck.
Go to Step 6.
6
4L/N switch check
1) Check 4L/N switch for operation referring to “Transfer
Assembly Inspection in Section 3C”.
Is check result satisfactory?
4L/N switch circuit open.
If wire and connections
are OK, substitute a
known-good TCM and
recheck.
Replace 4L/N switch.