check engine OPEL FRONTERA 1998 Workshop Manual

TRANSMISSION CONTROL SYSTEM (4L30–E)7A1–51
DTC P0730 Transmission Incorrect Gear Ratio
D07RT015
Circuit Description
The Powertrain Control Module (PCM) calculates the
slippage of the converter and transmission based
upon the engine speed, the output speed, and the
current gear ratio.
The slippage of the converter at a high enough engine
speed is low. The transmission should not slip more
than a given value when there is no shift.
This DTC detects a slip at each gear. This is a type
“C” DTC.
Conditions For Setting The DTC
No Output Speed Sensor DTC(s) P0722, P0723.
Not in Park, Neutral, or Reverse.
Engine speed is greater than 3,500 rpm.
3 seconds since upshift.
3 seconds since downshift.
3 seconds since garage shift (ND).
And one of the following conditions occur:
– Slip is greater than 508 rpm in 1st gear.
– Slip is greater than 468 rpm in 2nd gear.
– Slip is greater than 449 rpm on 3rd gear.
– Slip is greater than 440 rpm on 4th gear.
All conditions met for 5.5 seconds.
Action Taken When The DTC Sets
Maximum line pressure.
The PCM will illuminate the CHECK TRANS Lamp.

7A1–52
TRANSMISSION CONTROL SYSTEM (4L30–E)
Conditions For Clearing The DTC/CHECK
TRANS Lamp
The PCM will turn “off” the CHECK TRANS Lamp
after three consecutive ignition cycles without a
failure reported.
The DTC can be cleared from PCM memory by using
a scan tool.
The DTC can also be cleared from memory when the
vehicle has made 40 warmup cycles without a failure
reported.
The PCM will cancel the DTC Actions Taken items
when the fault conditions no longer exist and the
ignition is cycles “off” long enough to power down the
PCM.
Diagnostic Aids
Check for intermittent output speed sensor circuit
problems.
Check for possible incorrect calibration. (PCM part
No., tire specification, and rear axle ratio)
Test Description
The numbers below refer to the step numbers on the
diagnostic chart:
3. This step checks for possible low fluid level causing
slipping resulting in an undefined gear ratio.
4. This step checks for correct gear ratios for
commanded gears.
5. This step checks for low line pressure.
DTC P0730 Transmission Incorrect Gear Ratio
StepActionYe sNo
1Visually inspect the transmission cooling system for fluid leaks.
Refer to Chart 16: Possible Causes of Transmission Fluid
Leaks of Mechanical/Hydraulic Diagnosis Symptoms Index in
Automatic Transmission (4L30–E) section
Was condition found and corrected?
Go to Step 6Go to Step 2
2Refer to Checking Transmission Fluid Level and Condition in
Automatic Transmission (4L30–E) section.
Has transmission fluid checking procedure been performed?
Go to Step 3
Go to Checking
Transmission
Fluid Level and
Condition in
Automatic
Transmission
(4L30–E) section
31. Install the scan tool.
2. Turn the ignition switch to the “on” position.
3. Engine not running.
NOTE: Before clearing DTC(s) use the scan tool to record the
“Failure Records” for reference, as data will be lost when the “Clear
Info” function is used.
4. Record the Failure Record data.
5. Use the scan tool snapshot mode to record transmission gear
ratios.
6. Drive vehicle in transmission gear ranges 1, 2, 3, and D with
the engine speed is greater than 3,500 rpm for 5.5 seconds.
7. Record each transmission gear.
1st:2.73 – 2.99
2nd:1.54 – 1.71
3rd:0.93 – 1.05
4th:0.66 – 0.78
Does commanded gear ratio match ranges as shown?
Refer to
Diagnostic Aids
Go to Step 4
4Perform line pressure check.
Refer to Line Pressure Test in Automatic Transmission
(4L30–E) section.
Was condition found and corrected?
Go to Step 6Go to Step 5

TRANSMISSION CONTROL SYSTEM (4L30–E)7A1–53
DTC P0730 Transmission Incorrect Gear Ratio (Cont’d)
StepNo Ye s Action
5Check for possible clutch slippage.
Refer to Chart 6: Diagnostic Trouble Code (DTC) P0730 of
Mechanical/Hydraulic Diagnosis Symptoms Index in
Automatic Transmission (4L30–E) section.
Was condition found and corrected?
Go to Step 6—
61. After the repair is complete, use the scan tool to select “DTC”,
then “Clear info” function.
2. Operate the vehicle under the following conditions:
Drive the vehicle in D4 with the engine speed greater than
3,500 rpm to obtain anyone of the following gear ratios for
seven seconds.
1st 1:2.73 – 1:2.99
2nd 1:1.54 – 1:1.71
3rd 1:0.93 – 1:1.05
4th 1:0.66 – 1:0.78
Has the last test failed?
Begin diagnosis
again
Go to Step 1
Repair verified
Exit DTC table

7A1–54
TRANSMISSION CONTROL SYSTEM (4L30–E)
DTC P0748 Pressure Control Solenoid (PCS) (Force Motor) Circuit Electrical
D07RW008
Circuit Description
The PCS is a PCM–controlled device used to regulate
transmission line pressure. The PCM compares TPS
voltage, engine rpm, and other inputs to determine the
line pressure appropriate for a given load. The PCM will
regulate the pressure by applying a varying amperage to
the PCS. The applied amperage can vary from 0.1 to 1
amp, and is monitored by the PCM.
This DTC detects a continuous open or short to ground in
the PCS circuit or the PCS. This is a type “C” DTC.
Conditions For Setting The DTC
Battery voltage is between 10 and 16 volts.
The PCM detects that the different between
commanded and actual current is 200 milliampere
(mA) for over 1 second.
Action Taken When the DTC Sets
Maximum line pressure.
The PCM will illuminate the CHECK TRANS Lamp.
Conditions For Clearing The DTC/CHECK
TRANS Lamp
The PCM will turn “off” the CHECK TRANS Lamp
after three consecutive ignition cycles without a
failure reported.
The DTC can be cleared from PCM history by using a
scan tool.
The DTC will be cleared from memory when the
vehicle has achieved 40 warmup cycles without a
failure reported.
The PCM will cancel the DTC default actions when
the fault no longer exists and the ignition is cycled “off”
long enough to power down the PCM.
Diagnostic Aids
Inspect the wiring for poor electrical connection at the
PCM and at the transmission 5–way connector. Look
for possible bent, backed out, deformed or damaged
terminals. Check for weak terminal tension as well.
Also check for a chafed wire that could short to bare
m e t a l o r o t h e r w i r i n g . I n s p e c t f o r a b r o k e n w i r e i n s i d e
the insulation.
When diagnosing for a possible intermittent short or
open condition, move the wiring harness while
observing test equipment for a change.
Test Description
The numbers below refer to the step numbers on the
diagnostic chart:
2. This test checks the ability of the PCM to command
the PCS.
3. This test checks the PCS and internal wiring harness
for incorrect resistance.

7A1–56
TRANSMISSION CONTROL SYSTEM (4L30–E)
DTC P0753 Shift Solenoid A Electrical
D07RW009
Circuit Description
The shift solenoid A is a simple on/off solenoid
located in the main case valve body. The solenoid is
the normally closed type. In second or third gear, the
Powertrain Control Module (PCM) energizes the
solenoid to open a fluid inlet port. When the port is
open, fluid pressure actuates the shift valve.
The solenoid is activated by current. This current is
produced by applying a voltage to one side (the High
side) and a ground to the other side (Low side).
The High Side Driver (HSD) is a circuit of the PCM
that acts as a switch between the solenoids and the
supply voltage. The High side of the solenoid is
permanently supplied with voltage, except in
BACKUP MODE or when ignition is off the HSD is
turned off.
This DTC detects a continuous open or short to ground in
the shift solenoid A circuit or the shift solenoid A. This is a
type “C” DTC.
Conditions For Setting The DTC
Ignition is “on”, Engine “run”.
Battery voltage is between 10 and 16 volts.
The PCM commands the solenoid “on” and the
voltage remains high (B+) or the PCM commands the
solenoid “off” and the voltage remains low (zero
volts).
All conditions met for 0.33 seconds.
Action Taken When The DTC Sets
Maximum line pressure.
Immediate landing to 4th gear.
Inhibit TCC engagement.
The PCM will illuminate the CHECK TRANS Lamp.
Conditions For Clearing The MIL/DTC
The PCM will turn off the CHECK TRANS Lamp after
three consecutive ignition cycles without a failure
reported.
The DTC can be cleared from the PCM history by
using a scan tool.
The DTC will be cleared from history when the vehicle
has achieved 40 warmup cycles without a failure
reported.
The PCM will cancel the DTC default actions when
the fault no longer exists and the ignition is cycled “off”
long enough to power down the PCM.
Diagnostic Aids
Inspect the wiring for poor electrical connection at the
PCM and at the transmission 16–way connector.
Look for possible bent, backed out, deformed or
damaged terminals. Check for weak terminal tension
as we ll. A lso ch eck fo r a ch af e d w ire th at cou l d s ho r t
to bare metal or other wiring. Inspect for a broken wire
inside the insulation.

TRANSMISSION CONTROL SYSTEM (4L30–E)7A1–57
When diagnosing for a possible intermittent short or
open condition, move the wiring harness while
observing test equipment for a change.
An open ignition feed circuit can cause multiple DTCs
to set.
Test Description
The numbers below refer to the step numbers on the
diagnostic chart:
3. This test checks for power to the shift solenoid A
from the ignition through the PCM.
5. This test measures the resistance of the component.9. This test checks the function of the shift solenoid A
and the transmission internal wiring harness.
Shift Solenoid Status Chart
Gear
Shift solenoid AShift solenoid B
1stOFFON
2ndONON
3rdONOFF
4thOFFOFF
DTC P0753 Shift Solenoid A Electrical
StepActionYe sNo
11. Install the scan tool.
2. With the engine “on”, turn the ignition switch “on”.
NOTE: Before clearing DTC(s), use the scan tool to record “Failure
Records” for reference, as data will be lost when the “Clear Info”
function is used.
3. Record the DTC “Failure Records”.
Were DTCs P0753, P0758, P1860 set?
Go to Step 2
Go to Diagnostic
Aids
21. Turn the ignition “on”.
2. Using the J39200 DVOM, measure the voltage between PCM
connector terminals J3–E14 and J2–C8 (GND).
Is the voltage within 10–12 volts?
Go to Step 3Go to Step 4
31. Turn the ignition “off”.
2. Disconnect the J3 (BLUE) PCM connector.
3. Turn the ignition “on”.
4. Using the J39200 DVOM, measure the voltage between PCM
connector terminals J3–F14 and ground.
Is the voltage within 10 – 12 volts?
Go to Step 10Go to Step 4
41. Turn the ignition “off”.
2. Disconnect the J3 (BLUE) PCM connector.
3. Using the J39200 DVOM, measure the resistance between
PCM connector terminals J3–E14 and J3–F14.
Is the resistance within 18 – 20 ohms?
Go to Step 5Go to Step 6
51. Disconnect the J1 (RED) and J2 (WHITE) PCM connectors.
2. Using the J39200 DVOM, check a continuity between PCM
terminals J3–F14 and ground.
Is there a continuity?
Go to Step 11Go to Step 7
61. Disconnect the 16–way harness connector H–53.
2. Using the J39200 DVOM, measure the resistance between
terminals H53–14 and H53–15.
Is the resistance within 18–20 ohms?
Go to Step 13Go to Step 8
7Using the J39200 DVOM, check a continuity between J3 (BLUE)
PCM terminal E14 and ground.
Is there a continuity?
Go to Step 12Go to Step 9
81. Disconnect the transmission main case 4 pin connector M–7.
2. Using the J39200 DVOM, measure the resistance between
terminals M7–3(D) and M7–4(C).
Is the resistance within 18–20 ohms?
Go to Step 14Go to Step 15

TRANSMISSION CONTROL SYSTEM (4L30–E)7A1–59
DTC P0758 Shift Solenoid B Electrical
D07RW009
Circuit Description
The shift solenoid B is a simple on/off solenoid
located in the main case valve body. It is normally
open. When the port is open, fluid pressure actuates
the shift valve. In first or second gear, the Powertrain
Control Module (PCM) energizes the solenoid to
close a fluid inlet port.
The solenoid is activated by current. This current is
procuded by applying a voltage to one side (the High
side) and a ground to the other side (Low side).
The High Side Driver (HSD) is a circuit of the PCM
that acts as a switch between the solenoids and the
supply voltage. The High side of the solenoid is
permanently supplied with voltage. In BACKUP
MODE or when the ignition is off, the HSD is turned
off.
This DTC detects a continuous open or short to ground in
the shift solenoid B circuit or shift solenoid B. This is a
type “C” DTC.
Conditions For Setting The DTC
Ignition is “on”, Engine “run”.
Battery voltage is between 10 and 16 volts.
The PCM commands the solenoid “on” and the
voltage remains high (B+)or the PCM commands the
solenoid “off” and the voltage remains low (zero
volts).
All conditions met for 0.33 seconds.
Action Taken When The DTC Sets
Fixed to 4th gear.
Maximum line pressure.
Inhibit TCC engagement.
The PCM will illuminate the CHECK TRANS Lamp.
Conditions For Clearing The MIL/DTC
The PCM will turn off the CHECK TRANS Lamp after
three consecutive ignition cycles without a failure
reported.
The DTC can be cleared from the PCM history by
using a scan tool.
The DTC will be cleared from history when the vehicle
has achieved 40 warmup cycles without a failure
reported.
The PCM will cancel the DTC default actions when
the fault no longer exists and the ignition is cycled “off”
long enough to power down the PCM.
Diagnostic Aids
Inspect the wiring for poor electrical connections at
the PCM and at the transmission 16–way connector.
Look for possible bent, backed out, deformed or
damaged terminals. Check for weak terminal tension
as we ll. A lso ch eck fo r a ch af e d w ire th at cou l d s ho r t
to bare metal or other wiring. Inspect for a broken wire
inside the insulation.

7A1–60
TRANSMISSION CONTROL SYSTEM (4L30–E)
When diagnosing for a possible intermittent short or
open condition, move the wiring harness while
observing test equipment for a change.
Test Description
The numbers below refer to the step numbers on the
diagnostic char:
5. This test measures the resistance of the component.
7. This test checks the function of the shift solenoid B
and the transmission internal wiring harness.
11.This test checks for power to the shift solenoid B
from the ignition through the PCM.Shift Solenoid Status Chart
Gear
Shift solenoid AShift solenoid B
1stOFFON
2ndONON
3rdONOFF
4thOFFOFF
DTC P0758 Shift Solenoid B Electrical
StepActionYe sNo
11. Install the scan tool.
2. With the engine “on”, turn the ignition switch “on”.
NOTE: Before clearing DTC(s), use the scan tool to record “Failure
Records” for reference, as data will be lost when the “Clear Info”
function is used.
3. Record the DTC “Failure Records”.
Were DTCs P0753, P0758, P1860 set?
Go to Step 3Go to Step 2
21. The engine “on”.
2. Apply brake pedal and select transmission range “D”.
3. Press and hold down the winter switch and select transmission
mode “winter”.
Does the scan tool display DTC P0758 at 3rd gear?
Go to Step 7
Go to Diagnostic
Aids
31. Turn the ignition “off”.
2. Disconnect the J2 (WHITE) and J3 (BLUE) PCM connectors.
3. Turn the ignition “on”.
4. Using the J39200 DVOM, measure the voltage between PCM
connector terminals J2–C2 and J2–C8.
Is the voltage within 10 – 12 volts?
Go to Step 14Go to Step 4
41. Turn the ignition “off”.
2. Using the J39200 DVOM, measure the resistance between
PCM connector terminals J2–C2 and J3–E14.
Is the resistance within 18 – 20 ohms?
Go to Step 15Go to Step 5
51. Disconnect the transmission 16–way connector H–53.
2. Using the J39200 DVOM, measure the resistance between
terminals H53–16 and H53–15.
Is the resistance within 18 – 20 ohms?
Go to Step 16Go to Step 6
61. Disconnect the transmission main case connector M–7.
2. Using the J39200 DVOM, measure the resistance between
terminals M7–1(A) and M7–4(C).
Is the resistance within 18 – 20 ohms?
Go to Step 17Go to Step 18
71. Turn the ignition “off”.
2. Disconnect the J2 (WHITE) and J3 (BLUE) PCM connectors.
3. Using the J39200 DVOM, measure the resistance between
PCM connector terminals J2–C2 and J3–E14.
Is the resistance within 18 – 20 ohms?
Go to Step 8Go to Step 9
8Using the J39200 DVOM, check a continuity between PCM
connector terminal J2–C2 and ground.
Is there a continuity?
Go to Step 19Go to Step 10

TRANSMISSION CONTROL SYSTEM (4L30–E)7A1–61
DTC P0758 Shift Solenoid B Electrical (Cont’d)
StepNo Ye s Action
91. Disconnect the transmission 16–way connector H–53.
2. Using the J39200 DVOM, measure the resistance between
terminals H53–16 and H53–15.
Is the resistance within 18–20 ohms?
Go to Step 20Go to Step 11
10Using the J39200 DVOM, check a continuity between PCM
connector terminal J3–E14 and ground.
Is there a continuity?
Go to Step 21Go to Step 12
111. Disconnect the transmission main case connector M–7.
2. Using the J39200 DVOM, measure the resistance between
terminals M7–1(A) and M7–4(C).
Is the resistance within 18 – 20 ohms?
Go to Step 22Go to Step 23
12Check every connection of the PCM and transmission 16–way
connector H–53.
Was a problem found and corrected?
Go to Step 25Go to Step 13
131. Connect the J2 (WHITE) and J3 (BLUE) PCM connectors to
the PCM.
2. Turn the ignition “on”, the engine “on”.
3. Repeat Step 3.
Does the scan tool display DTC P0758 at 3rd gear?
Go to Step 24
Go to Diagnostic
Aids
14The wiring harness between PCM connector terminal
J2–C2 and transmission main case terminal M7–1(A) is shorted
to voltage.
Was a problem found and corrected?
Go to Step 25—
15The PCM internal terminal J2–C2 is shorted to voltage.
Replace the PCM. Refer to Powertrain Control Module (PCM) in
Automatic Transmission (4L30–E) section.
Is the replacement complete?
Go to Step 25—
16The wiring harness between PCM connector and transmission
16–way connector is shorted.
Was a problem found and corrected?
Go to Step 25—
17The wiring harness between transmission 16–way connector and
transmission main case connector is shorted.
Was a problem found and corrected?
Go to Step 25—
18The shift solenoid B is faulty, or the internal wiring harness from
the shift solenoid B is shorted.
Was a problem found and corrected?
Go to Step 25—
19The wiring harness between PCM connector terminal
J2–C2 and transmission main case connector terminal M7–1(A)
is shorted to ground.
Was a problem found and corrected?
Go to Step 25—
20The wiring harness between PCM connector terminal J2–C2 and
transmission 16–way connector terminal H53–16, or between
PCM connector terminal J3–E14 and 16–way connector terminal
H53–15 is open.
Was a problem found and corrected?
Go to Step 25—

TRANSMISSION CONTROL SYSTEM (4L30–E)7A1–63
DTC P1790 ROM Transmission Side
Bad Check Sum
Circuit Description
Transmission Side Read Only Memory (ROM) and
Electronically Erasable Programmable Read Only
Memory (EEPROM) is an electronic circuit that controls
the transmission control in the Powertrain Control Module
(PCM).
This DTC detects a check sum error. This is a type “C”
DTC.
Conditions For Setting The DTC
Detects check sum error for 1 second.
Action Taken When The DTC Sets
Maximum line pressure.
Immediate landing to 4th gear.
Inhibit TCC engagement.
The PCM will illuminate the CHECK TRANS Lamp.
Conditions For Clearing The MIL/DTC
The PCM will turn off the CHECK TRANS Lamp after
three consecutive ignition cycles without a failure
reported.
The DTC can be cleared from the PCM history by
using a scan tool.
The DTC will be cleared from history when the vehicle
has achieved 40 warmup cycles without a failure
reported.
The PCM will cancel the DTC default actions when
the fault no longer exists and the ignition is cycled “off”
long enough to power down the PCM.
DTC P1790 ROM Transmission Side Bad Check Sum
StepActionYe sNo
11. Install the scan tool.
2. With the engine “off”, turn the ignition switch “on”.
NOTE: Before clearing DTC(s), use the scan tool to record “Failure
Records” for reference, as data will be lost when the “Clear Info”
function is used.
3. Record the DTC “Failure Records”.
Was DTC P1790 set?
Go to Step 4Go to Step 2
2Was DTC P1792 set?Go to Step 3—
31. Remove the PCM. Refer to Powertrain Control Module (PCM)
in Automatic Transmission (4L30–E) section.
2. Using the ITCS, make a reprogramming the transmission
EEPROM.
Was the reprogramming complete?
Go to Step 5—
4Replace the PCM.
Is the replacement complete?
Go to Step 5—
51. After the repair is complete, use the scan tool to select “DTC”,
then “Clear Info” function and operate the vehicle.
2. Review the scan tool “DTC Info”.
Has the last test failed or is the current DTC displayed?
Begin diagnosis
again
Go to Step 1
Repair verified
Exit DTC table