Dodge Ram Truck 1500-2500-3500. Manual — part 1062
P0237-MAP SENSOR VOLTAGE TOO LOW (CONTINUED)
3.
MAP SENSOR
While monitoring the scan tool, jumper the (F855) 5-volt supply circuit
to the (K37) signal circuit in the Map sensor harness connector.
Did the P0238-MAP SENSOR VOLTAGE TOO HIGH, DTC set?
Yes
>> Replace the MAP sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
No
>> Go To 4
4.
(K37) SIGNAL CIRCUIT SHORTED TO (K916)) SENSOR RETURN CIRCUIT
Turn the ignition off.
Disconnect the ECM harness 60 pin connector.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance between the (K37) signal circuit and (K916))
sensor return circuit in the MAP sensor harness connector.
Is the resistance greater than 100 K Ohms?
No
>> Repair (K37) signal circuit shorted to (K916)) sensor return
circuit or replace harness.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
Yes
>> Go To 5
9 - 1170
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P0237-MAP SENSOR VOLTAGE TOO LOW (CONTINUED)
5.
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO (K916)) SENSOR RETURN CIRCUIT
Measure the resistance between the (F855) 5-volt supply circuit and
(K916)) sensor return circuit in the MAP sensor harness connector.
Is the resistance greater than 100 K Ohms?
No
>> Repair (F855) 5-volt supply circuit shorted to (K916)) sen-
sor return circuit or replace harness.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
Yes
>> Go To 6
6.
(K37) SIGNAL CIRCUIT OPEN
Measure the resistance between the signal (K37) circuit in the Map
sensor harness connector with the (K37) signal circuit in the ECM har-
ness connector.
Is the resistance less than 10 Ohms?
Yes
>> Go To 7
No
>> Repair or replace the engine harness.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1171
P0237-MAP SENSOR VOLTAGE TOO LOW (CONTINUED)
7.
(F855) 5-VOLT SUPPLY CIRCUIT OPEN
Measure the resistance between the (F855) 5-volt supply circuit in the
Map sensor harness connector with the (F855) 5-volt supply circuit in
the ECM harness connector.
Is the resistance less than 10 Ohms?
Yes
>> Go To 8
No
>> Repair or replace the engine harness.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
8.
MAP SENSOR SIGNAL (K37) CIRCUIT SHORTED TO GROUND
Measure the resistance between the MAP Sensor Signal (K37) circuit
and the Battery negative terminal.
Is the resistance above 100k ohms?
Yes
>> Go To 9
No
>> Repair the MAP Sensor (K37) Signal circuit for a short to
ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
9 - 1172
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
DR/DH
P0237-MAP SENSOR VOLTAGE TOO LOW (CONTINUED)
9.
(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO (K916)) RETURN CIRCUIT OR GROUND
Measure the resistance between the (F855) 5-volt supply circuit in the
sensor harness connector and battery negative.
Is the resistance above 100k ohms?
Yes
>> Go To 10
No
>> Test Complete.
10.
ECM
Reconnect the ECM harness 60 pin connector.
While monitoring the scan tool, jumper the (F855) 5-volt supply circuit
to the (K37) signal circuit in the map sensor harness connector.
Did the P0238-MAP SENSOR VOLTAGE TOO HIGH, DTC set?
Yes
>> Test Complete.
No
>> Replace and program the ECM in accordance with the
Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 1
(DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES/ENGINE CONTROL MODULE - DIAG-
NOSIS AND TESTING)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1173
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