Toyota RAV4 Service Manual: Fuel pump control circuit
Description
When the engine is cranked, the starter relay drive signal output from the
star terminal of the ecm is
input into the sta terminal of the ecm, and ne signal generated by the
crankshaft position sensor is also
input into the ne+ terminal. Thus, the ecm interprets that the engine is
cranked, and turns the transistor
tr1 in the ecm internal circuit on. The current flows to the c/opn (circuit
opening) relay by turning the
tr1 on. Then, the fuel pump operates.
While the ne signal is input into the ecm, when the engine is running, the ecm
turns the tr1 on
continuously.
Wiring diagram
Inspection procedure
- Perform active test using intelligent tester (fuel pump/spd)
- Connect the intelligent tester to the dlc3.
- Turn the ignition switch on and turn the tester on.
- Select the following menu items: diagnosis /
enhanced obd ii / active test / fuel pump /
spd.
- Check whether the fuel pump operating sound occurs
when performing the active test on the tester.
Ok:
fuel pump operating sound occurs.
- Inspect instrument panel junction block assembly (c/opn relay input
voltage)
- Measure the voltage between the terminal of the
instrument panel junction block (j/b) and the body
ground when the ignition switch is turned on and off.
Standard voltage
- Check harness and connector (instrument panel j/b - integration
relay, ig2 relay)
- Remove the integration relay and ig2 relay from the
engine room no. 1 Relay block.
- Disconnect the instrument panel junction block
connector.
- Check the resistance.
Standard resistance (check for open)
Standard resistance (check for short)
- Reinstall the integration relay and ig2 relay.
- Reconnect the instrument panel junction block
connector.
- Inspect instrument panel junc.ssembly (c/opn relay)
- Remove the instrument panel junction block.
- Measure the c/opn relay resistance.
Standard resistance
Hint:
Relay coil circuit between if-4 and ie-5 is not through
ign fuse.
- Reinstall the instrument panel junction block.
- Check harness and connector (instrument panel j/b - ecm)
- Disconnect the a9 ecm connector.
- Disconnect the ie connector from instrument panel
junction block.
- Measure the resistance.
Standard resistance (check for open)
Standard resistance (check for short)
- Reconnect the instrument panel junction block and the
ecm connectors.
- Check harness and connector (c/opn relay - fuel pump - body ground)
- Check the harness and the connectors between the
instrument panel junction block assembly and the fuel
pump.
- Disconnect the ia instrument panel junction block
connector.
- Disconnect the s1 fuel pump connector.
- Measure the resistance.
Standard resistance (check for open)
Standard resistance (check for short)
- Check the harness and the connectors between the fuel
pump and the body ground.
- Disconnect the s1 fuel pump connector.
- Measure the resistance.
Standard resistance (check for open)
- Reconnect the instrument panel junction block
connector
- Reconnect the fuel pump connector.
- Inspect fuel pump
- Inspect fuel pump resistance.
- Measure the resistance between the terminals.
Standard resistance:
0.2 To 3.0 ٠at 20°c(68°f)
- Inspect fuel pump operation.
- Apply the battery voltage to both the terminals.
Notice:
- These tests must be done quickly (within 10
seconds) to prevent the coil from burning
out.
- Keep the fuel pump as far away from the
battery as possible.
- Always turn the voltage on and off on the
battery side, not the fuel pump side.
- Read value using intelligent tester (starter sig)
- Connect the intelligent tester to the dlc3.
- Turn the ignition switch on and turn the tester on.
- Select the following menu items: diagnosis /
enhanced obd ii / data list / primary /
starter sig.
- Check the result when the ignition switch is turned to on
and start.
Ok
- Read value using intelligent tester (engine spd)
- Connect the intelligent tester to the dlc3.
- Turn the ignition switch on and turn the tester on.
- Select the following menu items: diagnosis /
enhanced obd ii / data list / primary / engine
spd.
- Read the values displayed on the tester while cranking.
Standard:
values are displayed continuously.
Description
The ecm constantly generates 5 v power from the battery voltages supplied to
the +b (batt) terminal to
operate the microprocessor. The ecm also provides this power to the sensors
thr ...
Description
The mil (malfunction indicator lamp) is used to indicate vehicle malfunction
detections by the ecm.
When the ignition switch is turned on, power is supplied to the mil circuit, and
...
Other materials:
Luggage compartment
features
Cargo hooks
Raise the hooks to use.
The cargo hooks are provided for
securing loose items.
Caution
When the cargo hooks are not in use
To avoid injury, always return the cargo hooks to their stowed
positions.
Grocery bag hooks
Notice
Grocery bag hook weight capacity
Do not hang ...
Short in front driver side - side squib circuit
Description
The driver side - side squib circuit consists of the center airbag sensor and
the front seat side airbag lh.
This circuit instructs the srs to deploy when the deployment conditions are met.
These dtcs are recorded when a malfunction is detected in the driver side - side
sq ...
Installation
Hint:
Use the same procedures for the lh side and rh side.
The procedures listed below are for the lh side.
Install speed sensor front lh
Notice:
To prevent interference with other parts, do not twist
the sensor wire's painted line areas when installing
it.
Set the sensor body ...