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SUBJECT
DATE
SPN 723/FMI 3, 8, 10, 11, 31 - All Years
February 2013
Additions, Revisions, or Updates
Publication Number / Title
Platform
Section Title
Change
SPN 723/FMI 3 - All
Years
SPN 723/FMI 8 - All
Years
DDC-SVC-MAN-0084
DD Platform
SPN 723/FMI 10 - All
Years
Voltage readings are updated for accuracy.
SPN 723/FMI 11 - All
Years
SPN 723/FMI 31 - All
Years
All information subject to change without notice.
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2 SPN 723/FMI 3 - ALL YEARS
2
SPN 723/FMI 3 - ALL YEARS
This diagnostic is typically Open Circuit.
1. Disconnect the Camshaft Position (CMP) sensor.
2. Turn the ignition ON (key ON, engine OFF).
3. Measure the voltage between pins 1 and 3 of the CMP sensor harness.
a. If the voltage is greater than 4.5 volts, Go to step 5.
b. If the voltage is less than 4.5 volts, Go to step 4.
4. Measure the voltage between pin 1 of the CMP sensor harness and ground.
a. If the voltage is less than 4.5 volts, repair the wire between pin 1 of the CMP sensor harness and pin 82 of the
Motor Control Module (MCM) 120-pin connector.
b. If the voltage is greater than 4.5 volts, repair the wire between pin 3 of the CMP sensor harness and pin 48 of the
MCM 120-pin connector.
5. Measure the voltage between pins 2 and 3 of the CMP sensor harness.
a. If the voltage is greater than 11.5 volts, replace the camshaft position sensor. Refer to section "Removal of the
Camshaft Position Sensor".
b. If the voltage is less than 11.5 volts, repair the wire between pin 2 of the CMP sensor harness and pin 45 of the
MCM 120-pin connector.
4
All information subject to change without notice.
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SPN 723/FMI 8 - ALL YEARS
This diagnostic is typically Camshaft Position (CMP) Sensor Time Out.
Table 1.
SPN 723/FMI 8
Description
Camshaft Position Sensor Time Out
Monitored Parameter
Camshaft Position Sensor
Typical Enabling Conditions
Engine Idle
Monitor Sequence
None
Execution Frequency
Continuous when enabling conditions met
Typical Duration
10 Seconds
Dash Lamps
MIL, CEL
Engine Reaction
Derate 25%
Verification
Engine Idle (1 minute)
1. Use DDDL to insure that cranking speed is over 150 rpm. Is cranking speed over 150 rpm?
a. Yes; Go to step 2.
b. No; determine the cause of low crank speed.
2. Disconnect the CMP sensor electrical harness connector.
3. Turn on the ignition ON (key ON, engine OFF).
4. Inspect the sensor harness for bent, spread, or corroded pins.
a. If the pins are bent, spread, or corroded, repair as necessary.
b. If connector shows no signs of damage, Go to step 5.
5. Measure the voltage between pins 1 and 3 on the harness side of the CMP sensor.
a. If the voltage is greater than 4.5 volts, Go to step 6.
b. If the voltage is less than 4.5 volts, Go to step 7.
6. Measure the voltage between pins 2 and 3 on the harness side of the CMP sensor.
All information subject to change without notice.
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3 SPN 723/FMI 8 - ALL YEARS
a. If the voltage is less than 11.5 volts, repair the wire between pin 2 of the harness side of the CMP sensor and pin
45 of the Motor Control Module (MCM) 120-pin connector.
b. If the voltage is greater than 11.5 volts, Go to step 8.
7. Measure the voltage between pin 1 on the harness side of the CMP sensor and engine ground.
a. If the voltage is less than 4.5 volts, repair the wire between pin 1 of the harness side of the CMP sensor and pin
82 of the MCM 120-pin connector.
b. If the voltage is greater than 4.5 volts, repair the wire between pin 2 of the harness side of the CMP sensor and
pin 45 of the MCM 120-pin connector.
8. Has the engine had any gear train, camshaft, or flywheel repairs made?
a. Yes; verify proper gear train timing and proper flywheel installation. Refer to section "Camshaft Timing
Verification"
b. No; Go to step 9.
9. Remove the CMP sensor and inspect for damage. Is there damage to the sensor?
a. Yes; inspect the tone wheel on the intake cam for damage. Check gear train for excessive lash or damage. If
damage is found, repair as necessary, and replace the CMP sensor. Refer to section "Removal of the Camshaft
Position Sensor"
b. No; replace the camshaft position sensor. Refer to section "Removal of the Camshaft Position Sensor"
6
All information subject to change without notice.
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SPN 723/FMI 10 - ALL YEARS
This diagnostic is typically Camshaft Position (CMP) Sensor Signal Erratic.
Table 2.
SPN 723/FMI 10
Description
Camshaft Position Sensor Signal Erratic
Monitored Parameter
Camshaft Position Sensor Signal
Typical Enabling Conditions
Engine Idle
Monitor Sequence
None
Execution Frequency
Continuous when enabling conditions met
Typical Duration
2 Seconds
Dash Lamps
MIL
Engine Reaction
Verification
Engine Idle
NOTE: Software verification is for EPA10 vehicles ONLY.
1. Is the MCM software version 7.6 fuel map ZGS 002 (or newer) and is SPN 723/FMI 10 the only fault code present?
a. Yes; clear fault and release the vehicle.
b. No; Go to step 2.
2. Are any of the following faults also present?
• SPN 157/FMI (any)
• SPN 1077/FMI (any)
• SPN 651 through 656/FMI (any)
• SPN 3659 through 3664/FMI (any)
• SPN 636/FMI (any)
• SPN 723/FMI (any)
a. Yes; Go to step 3.
b. No; ignore SPN 723/FMI 10, and troubleshoot the other fault codes not listed above. Program the MCM to
software 7.6 (or higher) with fuel map version ZGS 002 (or higher). Corresponding ACM software should be 8.6
(or higher) and CPC software should be R22 (or higher). Clear fault and release the vehicle.
3. Use DDDL to insure that cranking speed is over 150 rpm. Is cranking speed over 150 rpm?
a. Yes; Go to step 4.
b. No; determine the cause of low crank speed.
4. Disconnect the CMP sensor harness connector.
5. Turn the ignition ON (key ON, engine OFF).
6. Inspect the sensor harness for bent, spread, or corroded pins.
a. If the pins are bent, spread, or corroded, repair as necessary.
b. If connector shows no signs of damage, Go to step 7.
7. Measure the voltage between pins 1 and 3 on the harness side of the camshaft position sensor.
a. If the voltage is greater than 4.5 volts, Go to step 8.
b. If the voltage is less than 4.5 volts, Go to step 9.
8. Measure the voltage between pins 2 and 3 on the harness side of the CMP sensor.
a. If the voltage is less than 4.5 volts, repair the wire between pin 2 of the harness side of the CMP sensor and pin
45 of the MCM 120-pin connector.
b. If the voltage is greater than 4.5 volts, Go to step 10.
9. Measure the voltage between pin 1 on the harness side of the CMP sensor and engine ground.
All information subject to change without notice.
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4 SPN 723/FMI 10 - ALL YEARS
a. If the voltage is less than 4.5 volts, repair the wire between pin 1 of the harness side of the CMP sensor and pin
82 of the MCM 120-pin connector.
b. If the voltage is greater than 4.5 volts, repair the wire between pin 2 of the harness side of the CMP sensor and
pin 45 of the MCM 120-pin connector.
10. Has the engine had any gear train, camshaft, or flywheel repairs made?
a. Yes; verify proper gear train timing and proper flywheel installation. Refer to section "Camshaft Timing
Verification".
b. No; Go to step 11.
11. Remove the CMP sensor and inspect for damage. Is there damage to the sensor?
a. Yes; inspect the tone wheel on the intake camshaft for damage. Check gear train for excessive lash or damage. If
damage is found, repair as necessary, and replace the CMP sensor. Program the MCM to software 7.6 (or newer)
with fuel map version ZGS 002 (or newer). Corresponding ACM software should be 8.6 (or newer) and CPC
software should be R22 (or newer).
b. No; program the MCM to software 7.6 (or newer) with fuel map version ZGS 002 (or newer). Corresponding
ACM software should be 8.6 (or newer) and CPC software should be R22 (or newer). Clear fault and release the
vehicle.
8
All information subject to change without notice.
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SPN 723/FMI 11 - ALL YEARS
This diagnostic is typically Camshaft Position (CMP) Sensor Failure.
Table 3.
SPN 723/FMI 11
Description
Camshaft Position Sensor Failure
Monitored Parameter
Camshaft Position Sensor
Typical Enabling Conditions
Engine Idle
Monitor Sequence
None
Execution Frequency
Continuous when enabling conditions met
Typical Duration
2 Seconds
Dash Lamps
MIL
Engine Reaction
Verification
Engine Idle
1. Use DDDL to insure that cranking speed is over 150 rpm. Is cranking speed over 150 rpm?
a. Yes; Go to step 2.
b. No; determine the cause of low crank speed.
2. Disconnect the CMP sensor harness connector.
3. Turn the ignition ON (key ON, engine OFF).
4. Inspect the sensor harness for bent, spread, or corroded pins.
a. If the pins are bent, spread, or corroded, repair as necessary.
b. If connector shows no signs of damage, Go to step 5.
5. Measure the voltage between pins 1 and 3 on the harness side of the CMP sensor.
a. If the voltage is greater than 4.5 volts, Go to step 6.
b. If the voltage is less than 4.5 volts, Go to step 7.
6. Measure the voltage between pins 2 and 3 on the harness side of the CMP sensor.
All information subject to change without notice.
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5 SPN 723/FMI 11 - ALL YEARS
a. If the voltage is less than 5.0 volts, repair the wire between pin 2 of the harness side of the CMP sensor and pin
45 of the Motor Control Module (MCM)120-pin connector.
b. If the voltage is greater than 5.0 volts, Go to step 8.
7. Measure the voltage between pin 1 on the harness side of the CMP sensor and engine ground.
a. If the voltage is less than 4.5 volts, repair the wire between pin 1 of the harness side of the CMP sensor and pin
82 of the MCM 120-pin connector.
b. If the voltage is greater than 4.5 volts, repair the wire between pin 3 of the harness side of the CMP sensor and
pin 48 of the MCM 120-pin connector.
8. Has the engine had any gear train, camshaft, or flywheel repairs made?
a. Yes; verify proper gear train timing and proper flywheel installation. Refer to section "Camshaft Timing
Verification".
b. No; Go to step 9.
9. Remove the CMP sensor and inspect for damage. Is there damage to the sensor?
a. Yes; inspect the tone wheel on the intake camshaft for damage. Check gear train for excessive lash or damage. If
damage is found, repair as necessary, and replace the camshaft position sensor. Refer to section "Removal of the
Camshaft Position Sensor".
b. No; replace the camshaft position sensor. Refer to section "Removal of the Camshaft Position Sensor".
10
All information subject to change without notice.
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SPN 723/FMI 31 - ALL YEARS
This diagnostic is typically No Match of Camshaft and Crankshaft Signals.
This may be due to an engine temporarily running in a reverse direction. Symptoms include smoke exiting from intake
manifold and a low idle speed, possibly due to a leaky injector.
Table 4.
SPN 723/FMI 31
Description
No Match of Camshaft and Crankshaft Signals
Monitored Parameter
Camshaft Reverse Direction Rising Edge Signal
Typical Enabling Conditions
Engine State and Low Idle and Camshaft Reverse Direction Error
Monitor Sequence
None
Execution Frequency
Continuous When Enabling Conditions Met
Typical Duration
2 Seconds
Dash Lamps
MIL, CEL
Engine Reaction
Derate 25%, Shutdown Priority
NOTE: A reverse rotation of the engine will affect oil pump output. Oil pressure must be checked for possible
bearing damage.
1. Turn the ignition ON (key ON, engine OFF).
2. Are there any Camshaft Position (CMP) sensor, Crankshaft Position (CKP) sensor, or oil pressure faults present?
a. Yes; repair those faults first.
b. No; Go to step 3.
3. Are there any throttle pedal or idle validation switch faults present?
a. Yes; repair those faults first.
b. No; Go to step 4.
4. Perform Idle Speed Balance (ISB) test. Are any faulty fuel injectors identified?
a. Yes; replace suspect fuel injector(s).
b. No; Go to step 5.
5. Use DDDL to insure that cranking speed is over 150 rpm. Is cranking speed over 150 rpm?
a. Yes; Go to step 6.
b. No; determine the cause of low crank speed.
6. Disconnect the CMP sensor harness connector.
7. Turn the ignition ON (key ON, engine OFF).
8. Inspect the sensor harness for bent, spread, or corroded pins.
a. If the pins are bent, spread, or corroded, repair as necessary.
b. If connector shows no signs of damage, Go to step 9.
9. Measure the voltage between pins 1 and 3 on the harness side of the CMP sensor.
a. If the voltage is greater than 4.5 volts, Go to step 10.
b. If the voltage is less than 4.5 volts, Go to step 11.
10. Measure the voltage between pins 2 and 3 on the harness side of the CMP sensor.
a. If the voltage is less than 11.5 volts, repair the wire between pin 2 of the harness side of the CMP sensor and pin
45 of the Motor Control Module (MCM) 120-pin connector.
b. If the voltage is greater than 11.5 volts, Go to step 11.
11. Measure the voltage between pin 1 on the harness side of the CMP sensor and engine ground.
a. If the voltage is less than 4.5 volts, repair the wire between pin 1 of the harness side of the CMP sensor and pin
82 of the MCM 120-pin connector.
All information subject to change without notice.
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6 SPN 723/FMI 31 - ALL YEARS
b. If the voltage is greater than 4.5 volts, repair the wire between pin 2 of the harness side of the CMP sensor and
pin 45 of the MCM 120-pin connector.
12. Has the engine had any gear train, camshaft, or flywheel repairs made?
a. Yes; verify proper gear train timing and proper flywheel installation. Refer to section "Camshaft Timing
Verification".
b. No; Go to step 13.
13. Remove the CMP sensor and inspect for damage. Is there damage to the sensor?
a. Yes; inspect the tone wheel on the intake camshaft for damage. Check gear train for excessive lash or damage. If
damage is found, repair as necessary and replace the camshaft position sensor. Refer to section "Removal of the
Camshaft Position Sensor".
b. No; replace the camshaft position sensor. Refer to section "Removal of the Camshaft Position Sensor".
12
All information subject to change without notice.
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