2006-11-16 14:50:25 · 4 answers · asked by HorribleDeath18 1 in Cars & Transportation ➔ Maintenance & Repairs
it's called the CCRM which stands for Constant Control Relay Module.
It houses all the relays for the a/c compressor, cooling fans,main engine relay wide open cutout relay etc etc
Here is the complete discription:
Description and Operation
Notes
The electro-drive cooling fan system consists of an electric motor attached to a fan shroud located behind the radiator. The electro-drive cooling fan is wired to operate only when the ignition switch is in the RUN position, thereby preventing cooling fan operation after the ignition switch is turned to the OFF position.
WARNING: DISCONNECT THE COOLING FAN PRIOR TO PERFORMING ANY UNDERHOOD SERVICE SINCE THE FAN COULD CYCLE IF THE IGNITION SWITCH IS LEFT IN THE ON POSITION EVEN THOUGH THE ENGINE IS NOT RUNNING.
The cooling fan is controlled during vehicle operation by the Integrated Control Module assembly and EEC-IV module, which will energize the cooling fan under the following conditions:
Cooling fan is turned on at low speed if:
1. Engine temperature is higher than normal. (Fan starts running at 102°C (215°F) , and stops running at 99°C (210°F) ).
2. A/C is on and vehicle speed does not provide enough natural airflow (Fan starts running at speeds at or below 69 km/h (43 mph) and stops running at 77 km/h (48 mph) ). low speed cooling fan motor operation is achieved by using a dropping resistor in series with the motor.
Cooling Fan Motor Circuit Diagram with Motor
* Cooling fan will run at high speed if:
1. Engine temperature is higher than desirable and fan has been operating at low speed. Fan starts running at high speed at 110°C (230°F) , and stops running at 107°C (224°F) ).
o Cooling Fan will not turn off (providing engine coolant temperature is not too high) if:
1. Driver demand is high (WOT mode).
2. A/C clutch is not cycling rapidly.
Several different integrated controller modules are available depending on application. Proper operation of the system cannot be obtained unless the correct integrated controller module is used.
Note: In addition to the cooling system the CCRM also controls these other systems.
PURPOSE
The Constant Control Relay Module (CCRM) interfaces with the Powertrain Control Module (PCM) to provide control of the cooling fan, A/C clutch, and fuel pump. The module includes the Electronic Engine Control (EEC) power relay to provide power to the PCM.
These relays are contained in one housing, resulting in longer service life and reduced wiring requirements for operation.
CONSTRUCTION
The CCRM has one 24-pin connector. Relays contained in the housing are independent of one another.
OPERATION
The relays contained within the CCRM are interdependent and work with each other. The following describes the different relay functions within the CCRM:
EEC Power Relay
For any other circuit in the CCRM to operate, this circuit must be powered up. This prevents actuators from being turned on without the EEC system having control over them.
Fuel Pump Relay
The fuel pump relay circuit controls the fuel pump. The PCM provides the ground circuit for the primary side of the relay. The secondary side supplies Battery Voltage (B+) to the fuel pump itself.
Low Fan Control Relay
The Low Fan Control (LFC) relay controls the electric cooling fan. The primary control circuit of the LFC relay is normally high (B+). In this state the low speed cooling fan runs continuously. The PCM grounds this circuit, pulling it low near zero volts, to turn the fan off. This "fail safe" is built into the fan control circuit to run the fan anytime the EEC power relay is activated if the PCM should fail open circuit.
High Fan Control Relay
The High Fan Control (HFC) circuit operates the high speed electric cooling fan. If the Engine Coolant Temperature (ECT) sensor relays a high temperature or overheat condition to the PCM, it activates the HFC. In order to turn the high speed cooling fan on, the PCM grounds the primary circuit of the HFC relay. The secondary circuit applies B+ to the cooling fan motor.
Wide Open Throttle A/C Control Relay
This circuit controls the A/C compressor clutch during normal operation. This circuit also disengages the A/C clutch as commanded by the PCM during Wide Open Throttle (WOT) conditions. This solid state relay has two control circuits. One is used to engage the A/C clutch upon demand from the vehicle operator and the A/C cycling pressure switch. The other control is used to disengage the clutch upon command from the PCM.
Power Ground
This circuit provides the CCRM with a ground source for operating various controls. The circuit uses one pin that goes to the battery negative terminal.
2006-11-16 15:02:35 · answer #1 · answered by Magikmann 4 · 0⤊ 1⤋
Constant Control Relay Module or CCRM
2006-11-16 14:57:16 · answer #2 · answered by yugie29 6 · 0⤊ 0⤋
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2016-10-22 05:44:53 · answer #3 · answered by ? 4 · 0⤊ 0⤋
sounds like a big mess to me
2006-11-16 14:54:48 · answer #4 · answered by sassytahoe 2 · 0⤊ 2⤋