Toyota RAV4 (XA40) 2013-2018 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.
![Toyota RAV4. Fuel pump control circuit](images/books/256/18/1.htm125.jpg)
Wiring diagram
![Toyota RAV4. Wiring diagram](images/books/256/18/1.htm126.jpg)
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.
![](images/books/256/18/1.htm95.gif)
- 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 ![](images/books/256/18/1.htm127.jpg)
![](images/books/256/18/1.htm98.gif)
- 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)
![](images/books/256/18/1.htm129.jpg)
Standard resistance (check for short)
![](images/books/256/18/1.htm130.jpg)
- Reinstall the integration relay and ig2 relay.
- Reconnect the instrument panel junction block
connector.
![](images/books/256/18/1.htm3.gif)
- Inspect instrument panel junc.ssembly (c/opn relay)
- Remove the instrument panel junction block.
- Measure the c/opn relay resistance.
Standard resistance ![](images/books/256/19/1.htm1.jpg)
Hint:
Relay coil circuit between if-4 and ie-5 is not through
ign fuse.
- Reinstall the instrument panel junction block.
![](images/books/256/19/1.htm3.gif)
- 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)
![](images/books/256/19/1.htm4.jpg)
Standard resistance (check for short)
![](images/books/256/19/1.htm5.jpg)
- Reconnect the instrument panel junction block and the
ecm connectors.
![](images/books/256/19/1.htm7.gif)
- 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)
![](images/books/256/19/1.htm8.jpg)
Standard resistance (check for short)
![](images/books/256/19/1.htm9.jpg)
- 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)
![](images/books/256/19/1.htm10.jpg)
- Reconnect the instrument panel junction block
connector
- Reconnect the fuel pump connector.
![](images/books/256/19/1.htm12.gif)
- 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.
![](images/books/256/19/1.htm14.gif)
![](images/books/256/19/1.htm15.gif)
- 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 ![](images/books/256/19/1.htm16.jpg)
![](images/books/256/19/1.htm18.gif)
- 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.
![](images/books/256/19/1.htm20.gif)
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:
Checking tires
Check if the treadwear indicators
are showing on the tires.
Also check the tires for uneven
wear, such as excessive wear
on one side of the tread.
Check the spare tire condition
and pressure if not rotated.
New tread
Worn tread
Treadwear indicator
The location of treadwear indicators
is show ...
Assist grips
An assist grip installed on the ceiling
can be used to support your
body while sitting on the seat.
Caution
Assist grip
Do not use the assist grip when getting in or out of the vehicle or
rising from
your seat.
Doing so could damage the assist grip, or could cause you to injure yourse ...
Rear wheel alignment
adjustment
Inspect tire
Inspect the tire (see page tw-1).
Measure vehicle height
Measure the vehicle height (see page sp-3).
Inspect toe-in
Standard toe-in
If the toe-in is not within the specified range, inspect the
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