DTC P0088 Without RPO CTF
Circuit Description
The common rail is installed on the intake manifold, and is equipped with a flow damper, pressure limiter, and common rail pressure sensor.
The common rail unit has a common fuel passage and fuel passage holes. The common rail pressure sensor is installed at the left end of the unit.
The engine control module (ECM) monitors the common rail pressure signals for voltage outside the normal range of 10-104 kPa (1.5-15 psi) of the rail pressure sensor. If the ECM detects a common rail pressure signal voltage that is excessively low, this DTC will set.
Conditions for Running the DTC
| • | The battery voltage is more than 8 volts. |
| • | The fuel injection pump speed is more than 450 RPM. |
| • | The coolant temperature is 60°C (140°F) or more. |
| • | DTC P0190, P0192, or P0193 is not set. |
Conditions for Setting the DTC
Common rail pressure is more than 10 MPa (1,450 psi) over the target pressure.
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. |
| • | The ECM limits fuel delivery. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Diagnostic Aids
Inspect for the following conditions:
| • | Poor connection at the ECM |
| Inspect the harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal-to-wire connection. |
| • | Damaged harness |
| Inspect the wiring harness for damage, shorts to ground, shorts to battery, and open circuits. If the harness appears to be OK, observe the Rail Pressure display on the scan tool while moving connectors and wiring harnesses related to the common rail pressure sensor. A change in the common rail pressure scan tool display will indicate the location of the fault. |
Step | Action | Value | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics | ||||||||||
1 | Does the DTC set while the engine is running? | -- | Go to Step 2 | Go to Diagnostic Aids | ||||||
2 |
Does the voltage measure more than the specified value? | 1.4 V | Go to Step 6 | Go to Step 3 | ||||||
3 |
Does the DTC reset? | -- | Go to Step 5 | Go to Step 4 | ||||||
4 | Inspect for a poor connection at the rail pressure sensor harness connector. Is the connection good? | -- | System OK | Go to Step 9 | ||||||
5 |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 7 | ||||||
6 |
Does each resistance measure less than the specified value? | 2 ohms | Go to Step 7 | Go to Step 10 | ||||||
7 | Measure the resistance of the following circuits to ground:
Does each resistance measure more than the specified value? | 10 M ohms | Go to Step 8 | Go to Step 11 | ||||||
8 |
Does the DTC reset? | -- | Go to Step 13 | Go to Step 12 | ||||||
9 | Repair the rail pressure sensor wiring harness. Did you complete the repair? | -- | Go to Step 14 | -- | ||||||
10 | Repair/replace or correct connections of the rail pressure sensor harness connector. Did you complete the action? | -- | Go to Step 14 | -- | ||||||
11 | Repair the rail pressure sensor harness short to ground. Did you complete the repair? | -- | Go to Step 14 | -- | ||||||
12 | Replace the rail pressure sensor harness. Did you complete the replacement? | -- | Go to Step 14 | -- | ||||||
13 | Replace the rail pressure sensor. Did you complete the replacement? | -- | Go to Step 14 | -- | ||||||
14 | Clear all DTCs then operate the vehicle within the conditions to run the DTC. Does the DTC reset? | -- | Go to Step 15 | Go to Step 17 | ||||||
15 | Replace the ECM. Did you complete the replacement? | -- | Go to Step 16 | -- | ||||||
16 | Clear all DTCs then operate the vehicle within the conditions to run the DTC. Does the DTC reset? | -- | Go to Step 2 | Go to Step 17 | ||||||
17 | Do any other DTCs set? | -- | System OK | |||||||
