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Intake Manifold Pressure Sensor Circuit
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 433 PID: P102 SPN: 102 FMI: 2 LAMP: Yellow SRT: 00-093 |
Voltage signal at intake manifold pressure signal pin 26 of the sensor harness connector indicates high intake manifold pressure but other engine characteristics indicate that intake manifold pressure must be low. |
None on performance. |
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Intake Manifold Pressure Sensor Circuit |
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Circuit Description
The intake manifold pressure sensor monitors intake manifold pressure and passes information to the electronic control module (ECM) through the sensor harness. If intake manifold pressure becomes too high, it will cause a derate condition.
Component Location
The intake manifold pressure sensor is located on the air intake manifold.
Shop Talk
- The ECM checks for this fault only at idle speed. If the intake manifold pressure shows too high of a value at this time, the ECM will log a fault code.
- Use the intake manifold pressure sensor breakout cable, Part Number 3824775, between the intake manifold pressure sensor and the sensor harness sensor connector, with keyswitch ON. Check with intake manifold pressure sensor connected and disconnected.
- Run an automated cylinder performance test and/or single-cylinder cutout test to detect an injector problem causing the fault. Look for alternate fuel sources, such as oil-filled charge air coolers or blown seals in the turbocharger causing this fault.
Cautions and Warnings
 CAUTION To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement: |
|
CAUTION To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM. |
|
CAUTION To reduce the possibility of pin and harness damage, use this test lead when taking a measurement: |
|
CAUTION To reduce the possibility of pin and harness damage, use this test lead when taking a measurement: |
|
CAUTION To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement: |
|
CAUTION To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement: |
|
CAUTION To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement: |
|
CAUTION To reduce the possibility of pin and harness damage, use this test lead when taking a measurement: |
Troubleshooting Steps
| STEPS | SPECIFICATIONS | |
|---|---|---|
| STEP 1. | Check the intake manifold pressure sensor. | |
| STEP 1A. Inspect the sensor circuit for tampering. | No tampering | |
| STEP 1B. Inspect the harness and the sensor connector pins. | No damaged pins | |
| STEP 1C. Read the fault codes. | Fault Code 433 active | |
| STEP 1D. Check the intake manifold pressure sensor supply voltage. | 4.75 to 5.25 VDC | |
| STEP 1D-1. Measure the voltage to the sensor. | ||
| STEP 1D-2. Measure the voltage from the ECM. | ||
| STEP 1E. Check the intake manifold pressure signal. | 0.42 to 0.58 VDC | |
| STEP 1E-1. Check for a short circuit from pin to pin. | ||
| STEP 1E-2. Check for continuity in sensor harness. | ||
| STEP 1E-3. Check for alternate fuel sources. | ||
| STEP 1E-4. Check for injectors out of specification. | ||
| STEP 2. | Check the sensor harness. | |
| STEP 2A. Inspect the harness and the ECM connector pins. | No damaged pins | |
| STEP 2B. Read the fault codes. | Fault Code 433 active | |
| STEP 2C. Check for a short circuit from pin to pin. | More than 100k ohms | |
| STEP 2D. Check for a short circuit to ground. | More than 100k ohms | |
| STEP 2E. Check for proper wiring and continuity. | Less than 10 ohms | |
| STEP 3. | Clear the fault codes. | |
| STEP 3A. Disable the fault code. | Fault Code 433 inactive | |
| STEP 3B. Clear the inactive fault code. | All fault codes cleared | |
Guided Step 1 – Check the intake manifold pressure sensor.
| Guided Step 1A – Inspect the sensor circuit for tampering. | |
|---|---|
Conditions
Action
|
|
| OK | NOT OK |
|
No tampering |
Remove and record tampering. If tampering has occurred, repair the circuit, and record the tampering. |
| Guided Step 1B – Inspect the harness and the sensor connector pins. | |
|---|---|
Conditions
Action
|
|
| OK | NOT OK |
|
No damaged pins |
Repair the damaged pins.
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| Guided Step 1C – Read the fault codes. | |
|---|---|
Conditions
Action
|
|
| OK | NOT OK |
|
Fault Code 433 active |
Repair complete. |
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CAUTION To reduce the possibility of pin and harness damage, use this test lead when taking a measurement: |
|
CAUTION To reduce the possibility of pin and harness damage, use this test lead when taking a measurement: |
|
CAUTION To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM. |
|
CAUTION To reduce the possibility of pin and harness damage, use this test lead when taking a measurement: |
| Guided Step 1D – Check the intake manifold pressure sensor supply voltage. | ||
|---|---|---|
Conditions
Action
|
|
|
| OK | NOT OK | |
|
4.75 to 5.25 VDC |
Does not meet specifications. |
|
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CAUTION To reduce the possibility of pin and harness damage, use this test lead when taking a measurement: |
| Guided Step 1D-1 – Measure the voltage to the sensor. | ||
|---|---|---|
Conditions
Action
|
|
|
| OK | NOT OK | |
|
4.75 to 5.25 VDC
|
Does not meet specifications. |
|
|
CAUTION To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM. |
|
CAUTION To reduce the possibility of pin and harness damage, use this test lead when taking a measurement: |
| Guided Step 1D-2 – Measure the voltage from the ECM. | |
|---|---|
Conditions
Action
|
|
| OK | NOT OK |
|
4.75 to 5.25 VDC
|
Replace the ECM. Refer to Procedure 019-031. |
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CAUTION To reduce the possibility of pin and harness damage, use this test lead when taking a measurement: |
|
CAUTION To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement: |
|
CAUTION To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement: |
| Guided Step 1E – Check the intake manifold pressure signal. | ||
|---|---|---|
Conditions
Action
|
|
|
| OK | NOT OK | |
|
0.42 to 0.58 VDC |
Does not meet specifications. |
|
|
CAUTION To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement: |
| Guided Step 1E-1 – Check for a short circuit from pin to pin. | ||
|---|---|---|
Conditions
Action
|
|
|
| OK | NOT OK | |
|
More than 100k ohms |
Repair or replace the sensor harness. |
|
|
CAUTION To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement: |
| Guided Step 1E-2 – Check for continuity in sensor harness. | ||
|---|---|---|
Conditions
Action
|
|
|
| OK | NOT OK | |
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Less than 10 ohms |
Correct pin-to-pin wiring or open circuit. |
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| Guided Step 1E-3 – Check for alternate fuel sources. | |
|---|---|
Conditions
ActionLook for alternate fuel sources creating extra boost:
|
|
| OK | NOT OK |
|
No alternate sources |
Remove alternate fuel sources. |
| Guided Step 1E-4 – Check for injectors out of specification. | |
|---|---|
Conditions
Action
Note: Depending on symptoms, different tests will be required. See guidelines for recommended diagnostics tests. If diagnostics are inconclusive, consider cylinders with higher exhaust temperatures or excessive smoke or fuel knock. |
|
| OK | NOT OK |
|
Injectors within specifications |
Proceed with troubleshooting conclusions from injector diagnostic testing. |
Guided Step 2 – Check the sensor harness.
| Guided Step 2A – Inspect the harness and the ECM connector pins. | |
|---|---|
Conditions
Action
|
|
| OK | NOT OK |
|
No damaged pins |
Repair the damaged pins.
|
| Guided Step 2B – Read the fault codes. | |
|---|---|
Conditions
Action
|
|
| OK | NOT OK |
|
Fault Codes 433 active |
Repair complete. |
|
CAUTION To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement: |
| Guided Step 2C – Check for a short circuit from pin to pin. | ||
|---|---|---|
Conditions
Action
|
|
|
| OK | NOT OK | |
|
More than 100k ohms |
Repair or replace the sensor harness. |
|
|
CAUTION To reduce the possibility of pin and harness damage, use this test lead when taking a measurement: |
| Guided Step 2D – Check for a short circuit to ground. | ||
|---|---|---|
Conditions
Action
|
|
|
| OK | NOT OK | |
|
More than 100k ohms |
Repair or replace the sensor harness. |
|
|
CAUTION To reduce the possibility of pin and harness damage, use the following test leads when taking a measurement: |
| Guided Step 2E – Check for proper wiring and continuity. | ||
|---|---|---|
Conditions
Action
|
|
|
| OK | NOT OK | |
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Less than 10 ohms |
Repair or replace the sensor harness. |
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Guided Step 3 – Clear the fault codes.
| Guided Step 3A – Disable the fault code. | |
|---|---|
Conditions
Action
|
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| OK | NOT OK |
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Fault Code 433 inactive |
Return to the troubleshooting steps, or contact your nearest Cummins Authorized Repair Location if all the steps have been completed and checked again. |
| Guided Step 3B – Clear the inactive fault codes. | |
|---|---|
Conditions
Action
|
|
| OK | NOT OK |
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All fault codes cleared |
Troubleshoot any remaining active fault codes. |
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Repair complete
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Appropriate troubleshooting chart
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