Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING [ENGINE CONTROL KL]
DTC P0107
EGR boost sensor circuit input signal out of self-test range minimum
DESCRIPTION
• Continuous memory DTC P0107 indicates that EGR boost signal circuit input is less than
self-test minimum
[Possible Cause]
• Damaged EGR boost sensor • Damaged PCM
• Damaged EGR boost solenoid valve • Damaged harness connector
• Damaged EGR boost solenoid valve to EGR boost • Damaged harness
sensor hose
STEP INSPECTION ACTION
1 CHECK EGR BOOST SENSOR CONSTANT
VOLTAGE
• Key on, engine off.
• EGR boost sensor disconnected.
• Measure voltage between constant voltage
circuit and ground circuit at EGR boost
sensor vehicle harness connector.
• Is voltage between 4.0 and 6.0 volts?
Yes Go to next step.
No
REPAIR open in constant voltage circuit.
2 CHECK CONTINUITY OF EGR BOOST
SENSOR SIGNAL CIRCUIT
• Key off.
• EGR boost sensor disconnected.
• Disconnect PCM. Inspect for damaged or
pushed out pins, corrosion, loose wires,
etc. Service as necessary.
• Install breakout box, leave PCM
disconnected.
• Measure resistance between EGR boost
signal circuit at EGR boost sensor vehicle
harness connector and Test Pin 34 at
breakout box.
• Is resistance less than 5 ohms?
Yes Go to next step.
No RESET PCM to completely clear DTCs.
tr After Repair Procedure
COMPLETE OBD II Drive Mode.
Confirm repair by performing EGR portion of OBD II drive
mode to check for DTCs.
3 CHECK EGR BOOST SIGNAL CIRCUIT FOR
SHORT TO GROUND
• Key off.
• EGR boost sensor disconnected.
• Breakout box installed, PCM disconnect.
• Measure resistance between Test Pin 34
and Test Pins 91, 51 and 103 at breakout
box.
• Is resistance greater than 10,000 ohms?
Yes Go to next step.
No
SERVICE short In EGR boost signal circuit.
REMOVE breakout box.
RECONNECT all components.
RESET PCM to completely clear DTCs.
tr After Repair Procedure
COMPLETE OBD II Drive Mode.
Confirm repair by performing EGR portion of OBD II drive
mode to check for DTCs.
4 CHECK RESPONSE OF EGR BOOST
SENSOR TO MANUALLY APPLIED SIGNAL
• Key off.
• Disconnect hose from EGR boost solenoid
to EGR boost sensor. Inspect for damage,
blockage, etc. Service as necessary.
• Breakout box installed, PCM connected.
• Key on.
• Using hand held pump, slowly apply and
maintain -7 1 kPa {-5 3 3 mmHg, -2 1 inHg),
while measuring EGR boost sensor voltage
response at Test Pin 34 of breakout box.
• Is voltage response between 0.8 and 1 .5
volts?
Yes REMOVE vacuum pump.
RECONNECT all components.
Go to DTC P0106 Troubleshooting step 5.
No REPLACE EGR boost sensor.
REMOVE breakout box.
RECONNECT all components.
RESET PCM to completely clear DTCs.
tr After Repair Procedure
COMPLETE OBD II Drive Mode.
Confirm repair by performing EGR portion of OBD II drive
mode to check for DTCs.
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