Suzuki Grand Vitara 1998, Service Manual

Page: 508 / 801

YH4
GRAND
VITARA
7E-6 DIFFERENTIAL (FRONT)
STEP ACTION YES NO
1 Turn ON ignition switch (but engine at stop) and
check malfunction indicator lamp.
Does lamp light up? Go to step 2. A trouble has
occurred at some
place. Repair it
referring to
MALFUNCTION
INDICATOR LAMP
(“CHECK ENGINE”
LAMP) CHECK in
DIAGNOSIS of
SECTION 6.
2 Check 4WD switch circuit.
Turn ignition switch ON and check that voltage
between terminal C51-2-18 and terminal C51-3-17
(ground) for G16 / J20 (terminal C51-1-11 and terminal
C51-3-26 (ground) for H25) is as follows.
When transfer shift lever is in N or 2H: 10 – 14 V
When transfer shift lever is in 4L or 4H: 0 – 1 V
Is the check result satisfactory?
Go to step 3. Check 4WD switch
(refer to SECTION
7A), “B / Or” and “B”
circuits of 4WD
switch.
If OK, substitute a
known-good ECM
(PCM) and recheck.
3 Check power supply.
1) Turn ignition switch ON.
2) Check voltage between C51-2-7 and C51-3-17
(ground) for G16 / J20 (C51-1-15 and C51-3-26
(ground) for H25). The check results should be as
follows.
When transfer shift lever is in N or 2H: 0 – 1 V
When transfer shift lever is in 4L or 4H: 10 – 14 V
Is the check result satisfactory?
Go to step 4. Check “R” circuit. If
it is OK, substitute a
known-good ECM
(PCM) and recheck.
4 Check air pump assembly circuit.
1) Check for proper connection to air pump
assembly at all terminals.
2) Turn ignition switch ON.
3) Check voltage between C51-2-27 and C51-3-17
(ground) for G16 / J20 (C51-1-18 and C51-3-26
(ground) for H25). The check result should be as
follows.
When transfer shift lever is in 2H or N: 0 – 1 V
When transfer shift lever is in 4L or 4H
(more than 4 seconds after shifted to 4L or 4H):
10 – 14 V
Is the check result satisfactory?
Go to step 5. Check air pump
assembly referring
to “ON-VEHICLE
SERVICE”, and then
“P” circuit.
If OK, substitute a
known-good ECM
(PCM) and recheck.
5 Check 4WD indicator lamp circuit.
1) Turn ignition switch ON.
2) Check voltage between E61-19 and C51-3-17
(ground) for G16 / J20 (C51-1-7 and C51-3-26
(ground) for H25). The check result should be as
follows.
When transfer shift lever is in 2H or N: 10 – 14 V
When transfer shift lever is in 4L or 4H: 0 – 1 V
Is the check result satisfactory?
4WD control system
is in good condition. Check “Or / B” circuit
(including indicator
lamp and
combination meter).
If OK, substitute a
known-good ECM
(PCM) and recheck.