Chrysler Town, Dodge Caravan. Manual — part 1170
Symptom:
*CHECKING THE MAF SENSOR CALIBRATION
POSSIBLE CAUSES
MAF - SIGNAL DEVIATION AT 2000 RPM
MAF - SIGNAL DEVIATION AT 3000 RPM
MAF - SIGNAL DEVIATION AT 4000 RPM
MAF - SIGNAL DEVIATION AT IDLE
TEST
ACTION
APPLICABILITY
1
Allow the engine to idle for 2 minutes.
NOTE: The induction tubes connected to the MAF Sensor and the turbo-
charger must be properly connected and without damage, air leaks or
restrictions.
With the DRBIII
t in Sensors, read the MASS AIR FLOW Volts.
Is the voltage between 2.0 and 2.7 volts?
All
Yes
→ Go To 2
No
→ Replace the Mass Air Flow Sensor.
2
Allow the engine to idle for 2 minutes.
NOTE: The induction tubes connected to the MAF Sensor and the turbo-
charger must be properly connected and without damage, air leaks or
restrictions.
With the DRBIII
t in Sensors, read the MASS AIR FLOW Volts.
With the transmission in Neutral and the parking brake set, increase engine speed
to 2000 rpm and note the DRB reading.
Is the voltage between 2.8 and 3.5 volts?
All
Yes
→ Go To 3
No
→ Replace the Mass Air Flow Sensor.
3
Allow the engine to idle for 2 minutes.
NOTE: The induction tubes connected to the MAF Sensor and the turbo-
charger must be properly connected and without damage, air leaks or
restrictions.
With the DRBIII
t in Sensors, read the MASS AIR FLOW Volts.
With the transmission in Neutral and the parking brake set, increase engine speed
to 3000 rpm and note the DRB reading.
Is the voltage between 3.5 and 4.1 volts?
All
Yes
→ Go To 4
No
→ Replace the Mass Air Flow Sensor.
223
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
4
Allow the engine to idle for 2 minutes.
NOTE: The induction tubes connected to the MAF Sensor and the turbo-
charger must be properly connected and without damage, air leaks or
restrictions.
With the DRBIII
t in Sensors, read the MASS AIR FLOW Volts.
With the transmission in Neutral and the parking brake set, increase engine speed
to 4000 rpm for 5.0 seconds and note DRB reading.
Is the voltage between 3.8 and 4.5 volts?
All
Yes
→ Test Complete.
No
→ Replace the Mass Air Flow Sensor.
224
DRIVEABILITY - DIESEL
*CHECKING THE MAF SENSOR CALIBRATION —
Continued
Symptom:
*CHECKING THE SPEED CONTROL OPERATION
POSSIBLE CAUSES
BRAKE SWITCH SIGNAL
CHECKING CRUISE SWITCHES
CHECKING THE ECM FOR DTC’S
CLUTCH PEDAL SWITCH
CLUTCH PEDAL SWITCH SENSE CIRCUIT OPEN
CLUTCH PEDAL SWITCH SENSE CIRCUIT SHORTED TO GROUND
ENGINE CONTROL MODULE
VSS SIGNAL
INTERMITTENT CONDITION
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read the ECM DTCs.
Are there any ECM DTCs present?
All
Yes
→ Refer to symptom list for problems related to the ECM DTC.
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→ Go To 2
2
Start the engine.
With the DRB, read the CRUISE SW VOLTS.
Observe the cruise switch volts on the DRB while pressing and holding each cruise
button separately.
NOTE: Pressing each cruise button should result in the following voltages:
ON/OFF 0.0 - 0.61v, SET 3.58 - 4.14v, RESUME/ACCEL 4.19 - 4.59v, CANCEL
1.28 - 1.88v, COAST 2.69 - 3.20v, No Button Pressed 4.74 - 5.2v
Does each switch provide the correct voltage?
All
Yes
→ Go To 3
No
→ Refer to symptom list for problems related to S/C Switches.
Perform SPEED CONTROL VERIFICATION - VER-4.
3
NOTE: Prior to testing the speed control operation, ensure the Learn Speed
Control feature has been performed on the ECM.
Test drive the vehicle above 60 km/h (35 MPH).
Attempt to Set the Speed Control.
Does the Speed Control function properly?
All
Yes
→ Test Complete.
No
→ Go To 4
225
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
4
Turn the ignition on.
With the DRBIII
t in Sensors, read Vehicle Speed.
Have an assistant drive the vehicle while you are observing the Vehicle Speed Signal
on the DRB.
While observing vehicle speed on the DRBIII
t, note any rapid changes (signal
dropouts) in the reading that do not correspond with actual vehicle speed.
Is the DRB displaying an accurate Vehicle Speed Signal?
All
Yes
→ Go To 5
No
→ Refer to symptom list for problems related to the Vehicle Speed
Sensor.
Perform SPEED CONTROL VERIFICATION - VER-4.
5
Turn the ignition on.
With the DRBIII
t in Inputs/Outputs, read the Primary and Secondary brake switch
states while pressing and releasing the Brake Pedal several times.
Did the DRB indicate the correct brake pedal state when pressing and releasing the
Brake Pedal?
All
Yes
→ Go To 6
No
→ Refer to symptom list for problems related to Brake Switch
Signal.
Perform SPEED CONTROL VERIFICATION - VER-4.
6
Turn the ignition on.
With the DRBIII
t in Inputs/Outputs, read the Clutch switch states while pressing
and releasing the Clutch Pedal several times.
Did the DRB indicate the correct clutch pedal state when pressing and releasing the
Clutch Pedal?
All
Yes
→ Go To 7
No
→ Go To 8
7
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→ Repair as necessary.
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→ Replace and program the Engine Control Module in accordance
with the Service Information.
Perform SPEED CONTROL VERIFICATION - VER-4.
226
DRIVEABILITY - DIESEL
*CHECKING THE SPEED CONTROL OPERATION —
Continued
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