Dtc P0470: Differential Sensor Circuit - Suzuki Grand Vitara 2011 Manual

1A-319 Engine General Information and Diagnosis: For Diesel Engine Model

DTC P0470: Differential Sensor Circuit

NOTE
• Conditions for applying fault finding procedures to stored faults:
The fault is declared present after the engine is started or following a road test.
• If the fault is present:
– The Injection warning light (gravity 1 warning light) is lit.
– The diagnostic of the diesel particulate filter is inhibited.
– Diesel particulate filter regenerations are inhibited.
Wiring Diagram
For wiring circuit and connector number, refer to "A-5 Engine and A/C Control System Circuit Diagram (DSL) in
Section 9A".
Detecting Condition
Displaying on SUZUKI scan tool
CO
CO0
CC1
D1
D2
Troubleshooting for CO: Open circuit and CC1: Short circuit to +12 V
Check the condition of the connectors on the differential pressure sensor and the ECM.
Repair if necessary.
Check the following connections for insulation, continuity and make sure there is no interference resistance:
• Between "C89-2" wire of differential pressure sensor connector and "C85-12" terminal of ECM connector
• Between "C89-3" wire of differential pressure sensor connector and "C85-14" terminal of ECM connector
• Between "C89-1" wire of differential pressure sensor connector and "C86-42" terminal of ECM connector
Repair if necessary.
Check for the presence of ground on "C89-2" of the differential pressure sensor connector.
Repair if necessary.
If the fault is still present, substitute a known-good ECM and recheck.
Troubleshooting for CO0: Open circuit or short circuit to vehicle body ground
Check the continuity, the absence of interference resistance and the insulation from vehicle body ground of the
following connections:
• Between "C89-3" wire of differential pressure sensor connector and "C85-14" terminal of ECM connector
• Between "C89-1" wire of differential pressure sensor connector and "C86-42" terminal of ECM connector
Repair if necessary.
If the fault is still present, substitute a known-good ECM and recheck.
Troubleshooting for D1: Inconsistency of signal and D2: Signal outside lower limit
Check the condition of the pressure pipes on the differential pressure sensor.
Verify that they are sealed and check their position.
Replace if necessary.
Check the condition of the connectors on the differential pressure sensor and the ECM.
Repair if necessary.
Check the continuity and for the absence of interference resistance on the following connections:
• Between "C89-3" wire of differential pressure sensor connector and "C85-14" terminal of ECM connector
• Between "C89-1" wire of differential pressure sensor connector and "C86-42" terminal of ECM connector
Repair if necessary.
If the fault is still present, change the differential pressure sensor.
Detecting condition
Open circuit
Open circuit or short circuit to vehicle body ground
Short circuit to +12 V
Inconsistency of signal
Signal outside lower limit
S6JB0A1124114