2005 INFINITI QX4 Factory Service Manual

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Page 225 of 3419

INFINITI QX4 2005 Factory Service Manual AT-154
DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE FUNCTION
Revision: October 20052005 QX56
DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE FUNCTION
PFP:31940
DescriptionECS00CIN
High a

AT-154
DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE FUNCTION
Revision: October 20052005 QX56
DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE FUNCTION
PFP:31940
DescriptionECS00CIN
High and low reverse clutch solenoid valve is controlled by the TCM in response to signals sent from the
PNP switch, vehicle speed sensor and accelerator pedal position sensor (throttle position sensor). Gears
will then be shifted to the optimum position.
This is not only caused by electrical malfunction (circuits open or shorted) but also by mechanical mal-
function such as control valve sticking, improper solenoid valve operation.
CONSULT-II Reference ValueECS0 0CIO
On Board Diagnosis LogicECS00CIP
This is an OBD-II self-diagnostic item.
Diagnostic trouble code “P1769 HLR/C SOL FNCTN” with CONSULT-II is detected under the following
conditions.
–When TCM detects that actual gear ratio is irregular, and relation between gear position and condition of
ATF pressure switch 6 is irregular during depressing accelerator pedal. (Other than during shift change)
–When TCM detects that relation between gear position and condition of ATF pressure switch 6 is irregular
during releasing accelerator pedal. (Other than during shift change)
Possible CauseECS0 0CIQ
Harness or connectors
(The solenoid and switch circuits are open or shorted.)
High and low reverse clutch solenoid valve
ATF pressure switch 6
DTC Confirmation ProcedureECS00CIR
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Start engine.
2. Accelerate vehicle to maintain the following conditions.
ACCELE POS: 1.5/8 - 2.0/8
Selector lever: “D” position
Gear position: 2nd
3rd Gear (HLR/C ON/OFF)
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.
3. Perform step “2” again.
4. Turn ignition switch “OFF”, then perform step “1” to “3” again.
5. Check “SELF-DIAG RESULTS” mode for “A/T” with CONSULT-
II. If DTC (P1769) is detected, refer to AT-155, "
Diagnostic Procedure" .
If DTC (P1767) is detected, go to AT- 1 5 3 , "
Diagnostic Procedure" .
If DTC (P1846) is detected, go to AT- 1 6 7 , "
Diagnostic Procedure" .
Item name Condition Display value (Approx.)
HLR/C SOL High and low reverse clutch disengaged. Refer to AT- 1 9
.0.6 - 0.8 A
High and low reverse clutch engaged. Refer to AT- 1 9
. 0 - 0.05 A
ATF PRES SW 6High and low reverse clutch engaged. Refer to AT- 1 9
.ON
High and low reverse clutch disengaged. Refer to AT- 1 9
.OFF
BCIA0030E

Page 226 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE FUNCTION
AT-155
D
E
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H
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J
K
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MA
B
AT
Revision: October 20052005 QX56
Diagnostic ProcedureECS00CIS
1. CHECK INPUT SIGNALS
With CONSULT-II
1. S

Page 227 of 3419

INFINITI QX4 2005 Factory Service Manual AT-156
DTC P1772 LOW COAST BRAKE SOLENOID VALVE
Revision: October 20052005 QX56
DTC P1772 LOW COAST BRAKE SOLENOID VALVEPFP:31940
DescriptionECS00CIT
Low coast brake solenoid valve is turned “ON”

Page 228 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1772 LOW COAST BRAKE SOLENOID VALVE
AT-157
D
E
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MA
B
AT
Revision: October 20052005 QX56
Diagnostic ProcedureECS00CIY
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Turn ignition switch �

Page 229 of 3419

INFINITI QX4 2005 Factory Service Manual AT-158
DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION
Revision: October 20052005 QX56
DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTIONPFP:31940
DescriptionECS00CIZ
Low coast brake solenoid valve

AT-158
DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION
Revision: October 20052005 QX56
DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTIONPFP:31940
DescriptionECS00CIZ
Low coast brake solenoid valve is turned “ON” or “OFF” by the TCM in response to signals sent from the
PNP switch, vehicle speed sensor and accelerator pedal position sensor (throttle position sensor). Gears
will then be shifted to the optimum position.
This is not only caused by electrical malfunction (circuits open or shorted) but also by mechanical mal-
function such as control valve sticking, improper solenoid valve operation.
CONSULT-II Reference ValueECS0 0CJ 0
On Board Diagnosis LogicECS0 0CJ 1
This is an OBD-II self-diagnostic item.
Diagnostic trouble code “P1774 LC/B SOLENOID FNCT” with CONSULT-II is detected under the following
conditions.
–When TCM detects that actual gear ratio is irregular, and relation between gear position and condition of
ATF pressure switch 2 is irregular during depressing accelerator pedal. (Other than during shift change)
–When TCM detects that relation between gear position and condition of ATF pressure switch 2 is irregular
during releasing accelerator pedal. (Other than during shift change)
Possible CauseECS0 0CJ 2
Harness or connectors
(The solenoid and switch circuits are open or shorted.)
Low coast brake solenoid valve
ATF pressure switch 2
DTC Confirmation ProcedureECS0 0CJ 3
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-II
1. Start engine.
2. Accelerate vehicle to maintain the following conditions.
Selector lever: “1” or “2” position
Gear position: “1st” or “2nd” gear (LC/B ON/OFF)
3. Perform step “2” again.
4. Turn ignition switch “OFF”, then perform step “1” to “3” again.
5. Check “SELF-DIAG RESULTS” mode for “A/T” with CONSULT-
II. If DTC (P1774) is detected, refer to AT-159, "
Diagnostic Pro-
cedure" .
If DTC (P1772) is detected, go to AT-157, "
Diagnostic Proce-
dure" .
WITH GST
Follow the procedure “With CONSULT-II”.
Item name Condition Display value
ON OFF SOLLow coast brake engaged. Refer to AT- 1 9
.ON
Low coast brake disengaged. Refer to AT- 1 9
.OFF
ATF PRES SW 2Low coast brake engaged. Refer to AT- 1 9
.ON
Low coast brake disengaged. Refer to AT- 1 9
.OFF
BCIA0030E

Page 230 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION
AT-159
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AT
Revision: October 20052005 QX56
Diagnostic ProcedureECS00CJ4
1. CHECK INPUT SIGNALS
With CONSULT-II
1. Start the eng

Page 231 of 3419

INFINITI QX4 2005 Factory Service Manual AT-160
DTC P1841 ATF PRESSURE SWITCH 1
Revision: October 20052005 QX56
DTC P1841 ATF PRESSURE SWITCH 1PFP:25240
DescriptionECS0 0CJ 5
Fail-safe function to detect front brake clutch solenoid valve con

Page 232 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1841 ATF PRESSURE SWITCH 1
AT-161
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B
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Revision: October 20052005 QX56
Diagnostic ProcedureECS00CJA
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Start engine.
2. Select “ECU

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