SYSTEM DESCRIPTION
The ECM uses the vehicle speed signal and signals from the transmission revolution sensors (NT, SP2) to detect the actual gear (1st, 2nd, 3rd, 4th, 5th or 6th gear).
The ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical problems of the shift solenoid valves, transmission valve body assembly or automatic transmission assembly (clutch, brake or gear etc.).
DTC No. |
DTC Detection Condition |
Trouble Area |
SAE |
---|---|---|---|
P28077F |
Either condition is met (2 trip detection logic):
|
|
P2808 |
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves on and off. According to the input turbine speed and output shaft speed, the ECM detects the actual gear (1st, 2nd, 3rd, 4th, 5th or 6th gear). When the gear commanded by the ECM and the actual gear are not the same, the ECM illuminates the MIL and stores the DTC.
MONITOR STRATEGY
Related DTCs |
P2808: Shift solenoid valve SL4/OFF malfunction Shift solenoid valve SL4/ON malfunction |
Required sensors/Components |
Shift solenoid valve SL4, Transmission revolution sensor (NT), Transmission revolution sensor (SP2), Crankshaft position sensor (NE) |
Frequency of operation |
Continuous |
Duration |
OFF malfunction (A) and (B): 0.5 sec. OFF malfunction (C): 0.8 sec. ON malfunction: 0.8 sec. |
MIL operation |
2 driving cycles |
Sequence of operation |
None |
TYPICAL ENABLING CONDITIONS
All:
The monitor will run whenever the following DTCs are not stored |
P0712, P0713 (TFT (ATF temperature) sensor circuit P0115, P0117, P0118 (ECT (Engine coolant temperature) sensor circuit) P0717, P07BF, P07C0 (Turbine speed sensor circuit) P0722, P077C, P077D (Output sensor circuit) P0335 (Crankshaft position sensor circuit (This condition applies only if using fail-safe)) P0748 (Shift solenoid valve SL1 circuit) P0778 (Shift solenoid valve SL2 circuit) P0798 (Shift solenoid valve SL3 circuit) P2810 (Shift solenoid valve SL4 circuit) P0327, P0328, P0332, P0333 (KCS (Knock control sensor) circuit) P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P060A, P060B, P060D, P060E, P0657, P1607, P2102, P2103, P2111, P2112, P2118, P2119, P2135 (ETCS (Electronic throttle control system)) U0100 (CAN communication system) |
TFT (ATF temperature) sensor circuit |
Not circuit malfunction |
ECT (Engine coolant temperature) sensor circuit |
Not circuit malfunction |
Turbine speed sensor circuit |
Not circuit malfunction |
Output speed sensor circuit |
Not circuit malfunction |
Shift solenoid valve SL1 circuit |
Not circuit malfunction |
Shift solenoid valve SL2 circuit |
Not circuit malfunction |
Shift solenoid valve SL3 circuit |
Not circuit malfunction |
Shift solenoid valve SL4 circuit |
Not circuit malfunction |
KCS (Knock control sensor) circuit |
Not circuit malfunction |
ETCS (Electronic throttle control system) |
Not system down |
CAN communication system |
Not system down |
Transmission range |
"D" |
Duration time from shifting "N" to "D" |
4 sec. or more |
TFT (ATF temperature) |
-10°C (14°F) or higher |
Engine |
Running |
ECM select gear |
3rd |
ECM indicated pressure value of SL1 |
1600 kPa (16.3 kgf/cm2, 232 psi) |
ECM indicated pressure value of SL2 |
0.1 kPa (0 kgf/cm2, 0 psi) |
ECM indicated pressure value of SL4 |
1600 kPa (16.3 kgf/cm2, 232 psi) |
Throttle valve opening angle |
3% or more |
ECM select gear |
5th |
ECM indicated pressure value of SL1 |
0.1 kPa (0 kgf/cm2, 0 psi) |
ECM indicated pressure value of SL2 |
1600 kPa (16.3 kgf/cm2, 232 psi) |
ECM indicated pressure value of SL4 |
1600 kPa (16.3 kgf/cm2, 232 psi) |
Throttle valve opening angle |
3% or more |
ECM select gear |
3rd |
Vehicle speed |
2 km/h (1.2 mph) or more |
Throttle valve opening angle |
7.7% or more at engine speed of 1600 rpm (Condition varies with engine speed) |
ECT (Engine coolant temperature) |
40°C (104°F) or higher |
Turbine speed / Output speed (NT / NO) in 1st gear |
3.3500 to 7.3000 |
Turbine speed / Output speed (NT / NO) in 2nd gear |
1.9500 to 2.4000 |
Turbine speed / Output speed (NT / NO) in 3rd gear |
1.3000 to 1.6500 |
Turbine speed / Output speed (NT / NO) in 4th gear |
0.9000 to 1.1000 |
Turbine speed / Output speed (NT / NO) in 5th gear |
0.6376 to 0.7376 |
Turbine speed / Output speed (NT / NO) in 6th gear |
0.5306 to 0.6306 |
ECM select gear |
1st |
Time after transition to 1st gear |
0.1 sec. or more |
Vehicle speed |
2 km/h (1.2 mph) to 40 km/h (24.9 mph) |
Engine speed - Turbine speed |
50 rpm or more |
ECT (Engine coolant temperature) |
40°C (104°F) or higher |
Turbine speed / Output speed (NT / NO) in 1st gear |
3.3500 to 7.3000 |
Turbine speed / Output speed (NT / NO) in 2nd gear |
1.9500 to 2.4000 |
Turbine speed / Output speed (NT / NO) in 3rd gear |
1.3000 to 1.6500 |
Turbine speed / Output speed (NT / NO) in 4th gear |
0.9000 to 1.1000 |
Turbine speed / Output speed (NT / NO) in 5th gear |
0.6376 to 0.7376 |
Turbine speed / Output speed (NT / NO) in 6th gear |
0.5306 to 0.6306 |
ECM select gear |
2nd |
Time after transition to 2nd gear |
0.1 sec. or more |
Vehicle speed |
2 km/h (1.2 mph) or more |
Throttle valve opening angle |
7.7% or more at engine speed of 1600 rpm (Condition varies with engine speed) |
ECT (Engine coolant temperature) |
40°C (104°F) or higher |
Turbine speed / Output speed (NT / NO) in 1st gear |
3.3500 to 7.3000 |
Turbine speed / Output speed (NT / NO) in 2nd gear |
1.9500 to 2.4000 |
Turbine speed / Output speed (NT / NO) in 3rd gear |
1.3000 to 1.6500 |
Turbine speed / Output speed (NT / NO) in 4th gear |
0.9000 to 1.1000 |
Turbine speed / Output speed (NT / NO) in 5th gear |
0.6376 to 0.7376 |
Turbine speed / Output speed (NT / NO) in 6th gear |
0.5306 to 0.6306 |
ECM select gear |
6th |
Time after transition to 6th gear |
0.1 sec. or more |
Vehicle speed |
2 km/h (1.2 mph) or more |
Throttle valve opening angle |
7.7% or more at engine speed of 1600 rpm (Condition varies with engine speed) |
ECT (Engine coolant temperature) |
40°C (104°F) or higher |
Turbine speed / Output speed (NT / NO) in 1st gear |
3.3500 to 7.3000 |
Turbine speed / Output speed (NT / NO) in 2nd gear |
1.9500 to 2.4000 |
Turbine speed / Output speed (NT / NO) in 3rd gear |
1.3000 to 1.6500 |
Turbine speed / Output speed (NT / NO) in 4th gear |
0.9000 to 1.1000 |
Turbine speed / Output speed (NT / NO) in 5th gear |
0.6376 to 0.7376 |
Turbine speed / Output speed (NT / NO) in 6th gear |
0.5306 to 0.6306 |
ECM select gear |
4th |
Time after transition to 4th gear |
0.1 sec. or more |
Vehicle speed |
2 km/h (1.2 mph) or more |
Throttle valve opening angle |
7.7% or more at engine speed of 1600 rpm (Condition varies with engine speed) |
ECT (Engine coolant temperature) |
40°C (104°F) or higher |
Turbine speed / Output speed (NT / NO) in 1st gear |
3.3500 to 7.3000 |
Turbine speed / Output speed (NT / NO) in 2nd gear |
1.9500 to 2.4000 |
Turbine speed / Output speed (NT / NO) in 3rd gear |
1.3000 to 1.6500 |
Turbine speed / Output speed (NT / NO) in 4th gear |
0.9000 to 1.1000 |
Turbine speed / Output speed (NT / NO) in 5th gear |
0.6376 to 0.7376 |
Turbine speed / Output speed (NT / NO) in 6th gear |
0.5306 to 0.6306 |
TYPICAL MALFUNCTION THRESHOLDS
Turbine speed - Output speed x 3rd gear ratio |
1000 rpm or more |
Turbine speed - Output speed x 5th gear ratio |
1000 rpm or more |
Turbine speed / Output speed when output speed less than 1000 rpm |
3.3500 to 7.3000 |
Turbine speed / Output speed when output speed less than 1000 rpm |
1.3000 to 1.6500 |
Turbine speed / Output speed when output speed less than 1000 rpm |
0.6376 to 0.7376 |
Turbine speed / Output speed when output speed less than 1000 rpm |
0.9000 to 1.1000 |
CONFIRMATION DRIVING PATTERN
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
HINT:
[*1] : Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Techstream Display |
Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
N/A |
|
HINT:
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P28077F) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Transmission / Trouble Codes.
(e) Read the DTCs using the Techstream.
Result
Result |
Proceed to |
---|---|
Only DTC P28077F is output |
A |
P28077F and other DTCs are output |
B |
HINT:
If a solenoid is stuck off, DTCs for several solenoids including the malfunctioning solenoid will be detected.
A |
GO TO STEP 3 |
|
2. |
PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE SHIFT POSITION) |
NOTICE:
This test should always be performed with at least 2 people.
(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the Techstream to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the Techstream on.
(f) Enter the following menus: Powertrain / Transmission / Active Test.
(g) According to the display on the Techstream, perform the Active Test.
HINT:
Comparing the gear commanded by the Active Test with the actual gear enables confirmation of the problem (See page ).
Transmission
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
---|---|---|---|
Control the Shift Position |
Operates the shift solenoid valves to allow gears to be selected manually. |
1st/2nd/3rd/4th/5th/6th Start/Stop |
Can be used to check the operation of the shift solenoid valves. Up-shifts and down-shifts should be performed consecutively. A 10 second interval is required between gear changes. Do not down-shift at high speeds. Doing so will damage the automatic transmission. [Vehicle Condition]
|
HINT:
(h) Compare the ECM commanded gear and the actual gear.
Result
Actual Gear during Malfunction |
ECM Commanded Gear |
Proceed to |
||||||
---|---|---|---|---|---|---|---|---|
1st |
2nd |
3rd |
4th |
5th |
6th |
|||
Shift solenoid valve SL1 |
Stuck ON |
1st |
2nd |
3rd |
4th |
4th |
4th |
A |
Stuck OFF |
N*1 |
N*1 |
N*1 |
N*1 |
5th |
6th |
||
Shift solenoid valve SL2 |
Stuck ON |
4th |
4th |
4th |
4th |
5th |
6th |
B |
Stuck OFF |
1st |
2nd |
3rd |
1st |
N*1 |
N*1 |
||
Shift solenoid valve SL3 |
Stuck ON |
2nd |
2nd |
3rd |
4th |
5th |
6th |
C |
Stuck OFF |
1st |
1st |
3rd |
4th |
5th |
N*1 |
||
Shift solenoid valve SL4 |
Stuck ON |
3rd |
3rd |
3rd |
4th |
5th |
5th |
D |
Stuck OFF |
1st |
2nd |
1st |
4th |
N*1 |
6th |
||
Shift solenoid valve SLT |
Stuck ON |
N*2 |
N*2 |
N*2 |
N*2 |
N*2 |
N*2 |
E |
Stuck OFF*3 |
1st |
2nd |
3rd |
4th |
5th |
6th |
HINT:
A |
GO TO DTC CHART (RELATED SHIFT SOLENOID VALVE SL1 PERFORMANCE DTC P07457F) |
B |
GO TO DTC CHART (RELATED SHIFT SOLENOID VALVE SL2 PERFORMANCE DTC P07757F) |
C |
GO TO DTC CHART (RELATED SHIFT SOLENOID VALVE SL3 PERFORMANCE DTC P07957F) |
E |
GO TO DTC CHART (RELATED SHIFT SOLENOID VALVE SLT PERFORMANCE DTC P27137F) |
|
3. |
INSPECT SHIFT SOLENOID VALVE SL4 |
(a) Remove shift solenoid valve SL4 (See page ). |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
1 - 2 |
20°C (68°F) |
5.0 to 5.6 Ω |
(c) Apply 12 V battery voltage to the shift solenoid valve and check that the valve moves and makes an operating noise.
OK:
Measurement Condition |
Specified Condition |
---|---|
|
Valve moves and makes an operating noise |
*1 |
Shift Solenoid Valve SL4 |
NG |
REPLACE SHIFT SOLENOID VALVE SL4 |
|
4. |
INSPECT TRANSMISSION VALVE BODY ASSEMBLY |
(a) Check the transmission valve body assembly (See page ).
OK:
There is no foreign matter on each valve and they operate smoothly.
OK |
REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY |
NG |
REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY |
Operation Check
OPERATION CHECK
1. CHECK WINDOW LOCK FUNCTION
(a) Turn the ignition switch ON.
(b) Press the window lock switch of the power window regulator master switch
assembly.
HINT:
The illumination (LED) built into the switch knob of each seat does not turn
off.
(c) Check that the power window fo ...
Disassembly
DISASSEMBLY
PROCEDURE
1. REMOVE GENERATOR PULLEY
(a) Mount the generator assembly in the vise between aluminum plates.
NOTICE:
Do not overtighten the vise.
(b) Install SST 1-A to the generator pulley shaft.
Text in Illustration
*a
Hold
Turn
...
Horn Relay
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT HORN RELAY ASSEMBLY
(a) Check the resistance.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Connection
...