Coronado 83.00, Troubleshooting Manual

Page 1: ...sed loop system that uses the climate control panel settings and the temperature sensors to control and maintain the out let temperature of the system The blend air system has an electronically contro...

Page 2: ...nd ACC circuits are pow ered Refrigerant system high side pressure is between 20 psi 140 kPa 450 psi 3100 kPa Pressure reading is taken at the bi nary switch System voltage is between 8 5 and 17 volts...

Page 3: ...air conditioning on blower speed switch to high temperature control switch to full cold recirculation switch off 11 On SleeperCabs set the sleeper climate control panel to the following settings or i...

Page 4: ...rmance low low side pressures even a vacuum etc Before re placing a TXV it is important to verify that there are no contaminates in the system and that the refrige rant charge is correct by performing...

Page 5: ...the leak rate for two Mini Statoseals should be consi dered a condemning value if it is not completely clear which seal is leaking Method IMPORTANT The refrigerant system should be warmed up from com...

Page 6: ...350 psi 2415 kPa is achieved Denso A C Compressor Pressure Test NOTE This test is meant to be performed after a failure has been repaired which may have caused damage to the compressor due to low refr...

Page 7: ...ower motor electronic module The electronic module monitors the blower tempera ture and enters a protection mode when normal tem perature is exceeded When the blower motor enters protection mode the b...

Page 8: ...ed by the time between each set of three pulses Time can be viewed using an oscilloscope rpm 1 time between sets of three pulses x 60 NA Error temperature protection mode 10Hz 25 Error voltage protect...

Page 9: ...ce the signal is active and as long as the other conditions are met the sig nal remains active until the evaporator temperature sensor reaches 37 F 3 C then becomes inactive The A C request signal doe...

Page 10: ...in A C mode does not necessarily mean that the A C compressor should be engaged See Table 4 for A C request rules NOTE If the air selection switch is changed to defrost when in A C mode the A C mode...

Page 11: ...ion mode prevents dusty or smoky air from entering the cab and provides better air conditioning performance since the cab air is al ready cooled and less humid than outside air Humid ity holds a lot o...

Page 12: ...is in the fully closed position B Recirc door in the narrow partially open position C Recirc door in the widest partially open position D In non recirc mode the recirc door is in the fully open positi...

Page 13: ...auxiliary unit until the bunk override switch is pressed in the momentary ON position again When the lower half of the bunk override switch is pressed bunk override mode turns off and the auxil iary u...

Page 14: ...it settings The auxiliary unit uses the temperature door position setting as a starting point then it goes into constant discharge temperature control CDTC operation to maintain the new desired temper...

Page 15: ...mode This is not how the system operates without DataLink Monitor connected to the vehicle On these early systems you will not be able to change the front settings and update the auxiliary unit with a...

Page 16: ...e is off in the auxiliary unit If the front blower speed setting was in the off position the blower will now shut off The A C mode indicator light will turnoff Actuator Stepper Motors Temperature Reci...

Page 17: ...he rotary switch to position 1 and note the reading on the multimeter 7 Move the toggle switch to REVERSED and note the reading on the multimeter 8 Repeat the previous three steps for the 2 3 and 4 ro...

Page 18: ...perature Sensor General Information The evaporator temperature sensor is located on the evaporator The sensor input to the FCU is used to control the A C compressor in order to prevent evaporator free...

Page 19: ...de actuator connector turn the ignition on measure voltage between connector pin 1 and ground For code 146 s009 05 front unit disconnect the temperature actuator connector turn the ignition on measure...

Page 20: ...de 146 s009 05 front unit disconnect all three actuator connectors and the FCU connector At the temperature actuator connector check continuity between connector pin 3 and ground Repeat for pins 4 5 a...

Page 21: ...Actuator f040620 07 02 2002 For code 200 s009 05 auxiliary unit disconnect the auxiliary unit temperature actuator connector and the ACU connector Check continuity between the following connector pins...

Page 22: ...6 s006 05 146 s009 05 disconnect all three actuator connectors and the FCU connector At each actuator connector check continuity between the following connector pins A2 B1 B2 B3 FCU 3 4 5 6 Actuator f...

Page 23: ...Check for short to ground in power wire between actuator and FCU ACU If no short is found replace FCU ACU then go to test no 9 9 Verify repair NOTE In order to check if a fault status has changed from...

Page 24: ...When testing the evaporator temperature sensor Fig 10 the resistance will decrease as the tem perature increases as shown in Fig 11 1 Remove the sensor and place it in a cup of ice water 2 After the s...

Page 25: ...HVAC units CDTC Temperature Sensor Test When testing the CDTC temperature sensor Fig 12 the resistance will decrease as the tem perature increases as shown in Fig 13 1 2 3 1 4 4 3 5 5 6 6 1 6 CW CCW...

Page 26: ...earn the extreme positions of the actuator motors for the recirc door tempera ture control door and the air selection mode door Use the following procedure to recalibrate the sys tem 1 Turn the igniti...

Page 27: ...the temperature mix door position bar graph When bunk override is initiated the front temperature mix door step count message is sent to the auxiliary unit The auxiliary unit uses this as its initial...

Page 28: ...s this as its initial tempera ture mix door setting to match the front temperature Auxiliary CDTC Discharge Temperature The auxiliary CDTC discharge temperature bar graph indicates the temperature of...

Page 29: ...l rules are met The A C mode annunciator has three possible condi tions ON OFF or NA ERR not available or error A C Clutch Annunciator The A C clutch annunciator indicates whether or not the signal to...

Page 30: ...e indicated by the FCU mode annunciator The FCU mode annunciator works similarly if bunk override is turned OFF The FCU mode annunciator has three possible con ditions ON OFF or NA ERR not available o...

Page 31: ...mode OFF test button is used to manually send a cab override OFF request to the FCU This is the same message the ACU sends to the FCU when it no longer requests A C support from the front unit The but...

Page 32: ...ode door actuator current above normal or circuit shorted to ground See Actuator Circuit Test table in Subject 350 for diagnosis 009 05 Temperature control door current below normal or open circuit Se...

Page 33: ...y PID PID FMI Fault Description Action 168 03 Supply voltage too high above 16 0 VDC Check vehicle charging system repair as necessary See Group 15 for more information 04 Supply voltage too low below...

Page 34: ...eedback differs from the speed control signal being sent by the ACU See Diagnosis for Blower Speed is Not Available table in Subject 350 250 02 J1587 databus data erratic inter mittent or incorrect Ch...

Page 35: ...cuit for diagnosis Ice formed on evaporator core Ice buildup on the evaporator core can block airflow through the evaporator thus producing little or no cooling This may occur if the compressor is not...

Page 36: ...nts for blockage blockage may be due to moisture causing ice buildup Refrigerant charge too low Perform leak test Repair any leaks evacuate the system replace the receiver drier only if color indicate...

Page 37: ...ature under light load or when ambient temperatures are low Temperature door not operating correctly Electrical problem with temperature actuator Check for fault codes See fault code tables in Subject...

Page 38: ...ith mode door Check for obstructions or broken components repair as necessary NOTE The actuator has no feedback to the FCU ACU to verify position If there are no fault codes and the actuator signal ap...

Page 39: ...See Table 11 Sleeper Climate Control Panel Circuit Diagnosis Faulty blower control potentiometer auxiliary unit only See Table 11 Sleeper Climate Control Panel Circuit Diagnosis Problem Bunk Override...

Page 40: ...C compressor to operate the controls must be set as follows blower speed at any set ting other than off air selection in one of A C or defrost settings A C button is pressed light on engine running a...

Page 41: ...he ambient air tempera ture Measure the resistance of the evaporator temperature sen sor and compare the reading with the value in Table 3 or Fig 1 The reading should co rrespond to a temperature ap p...

Page 42: ...check resistance between the ground side of the relay coil PDM side and the negative battery terminal Make sure the batteries are disconnected or result may be inconclusive Less than 1 ohm Go to test...

Page 43: ...Request Circuit Test Evaporator Temperature Sensor Temperature versus Resistance Temperature F C Resistance ohms Temperature F C Resistance ohms 20 6 7 12 814 55 12 8 4792 25 3 9 11 036 60 15 6 4209 3...

Page 44: ...ch relay from the PDM Measure the resistance between the PDM socket that corresponds to circuit 97T and the negative battery terminal NOTE Make sure batteries are disconnected Failure to do so may giv...

Page 45: ...drop measurements to isolate the problem then go to test no 6 Not 2 85 3 33 ohms On Denso compressors disconnect the compressor thermal cutoff switch and check it for continuity If the circuit is ope...

Page 46: ...CU bunk override mode state is OFF or NA ERR Go to test no 2 2 Verify J1587 communication Connect ServiceLink to the vehicle Check if both the FCU MID 146 and ACU MID 200 appear in the ECU list Both E...

Page 47: ...oblems repeat tests if necessary Bunk O R request annunciator remains in the ON state Check ACU it is not responding to the bunk override request Make sure it has power and ground andJ1587 databus com...

Page 48: ...essure up etc The front blower should be on low speed and the A C indicator light on the A C button should be on FCU rear override mode state annunciator in ON and A C mode annunciator is ON Go to tes...

Page 49: ...y replace FCU Go to test no 4 O R Request annunciator does not ever indicate it is in the ON state Repeat test no 3 If ambient temperature is low the auxiliary unit may not request rear override Repla...

Page 50: ...actuator connector turn the ignition on measure voltage between connector pin 1 and ground For code 146 s009 05 front unit disconnect the temperature actuator connector turn the ignition on measure v...

Page 51: ...e 146 s009 05 front unit disconnect all three actuator connectors and the FCU connector At the temperature actuator connector check continuity between connector pin 3 and ground Repeat for pins 4 5 an...

Page 52: ...ctuator f040620 07 02 2002 For code 200 s009 05 auxiliary unit disconnect the auxiliary unit temperature actuator connector and the ACU connector Check continuity between the following connector pins...

Page 53: ...s006 05 146 s009 05 disconnect all three actuator connectors and the FCU connector At each actuator connector check continuity between the following connector pins A2 B1 B2 B3 FCU 3 4 5 6 Actuator f0...

Page 54: ...t fault may be active FMI 05 Shorted actuator motor is likely Perform Actuator Stepper Motor Electrical Test to confirm then go to test no 9 Fault still active FMI06 Check for short to ground in power...

Page 55: ...Evaporator Temperature Sensor Circuit Test See Table 9 for the CDTC temperature sensor circuit test procedures CDTC Temperature Sensor Circuit Test Test No Test Test Procedure Test Result Action 1 Are...

Page 56: ...Condition 2 Go to test no 2 Condition 3 Go to test no 3 Condition 4 Go to test no 4 2 Check circuits 29A and GND1 Disconnect AS2 connector Turn headlights on Measure voltage at pins A and F of the AS...

Page 57: ...rocedure Test Result Action 1 Does the symptom involve both the blower and temperature control No affects only one of these Go to test no 4 Yes affects both Go to test no 2 2 Check the 12VDC ignition...

Page 58: ...er speed control knob from low to high Voltage ranges from 0 5 to 12 5VDC Sleeper climate control panel circuit is not the problem Check for fault codes and see Blower Motor Diagnostics Front and Auxi...

Page 59: ...voltage protection mode Correct voltage problem as necessary then go to test no 7 3 Check speed control signal at blower motor Disconnect the blower motor connector Turn ignition on Check voltage betw...

Page 60: ...t replace blower motor thengo to test no 7 No Replace blower motor then go to test no 7 7 Verify repair Verify that repair resolved the problem Problem resolved Done Problem unresolved Repeat test no...

Page 61: ...ower Motor 6 Temperature Actuator Fig 2 Cab HVAC Assembly 08 27 2002 f831539 2 3 4 1 1 CDTC Sensor 2 Temperature Actuator 3 Auxiliary Control Unit ACU 4 Blower Motor Fig 3 Auxiliary HVAC Assembly Heat...

Page 62: ...4 3 5 5 6 6 1 6 CW CCW 08 27 2002 f831500 Fig 4 Actuator Motor Pinouts Heater and Air Conditioner Troubleshooting 83 00 Symptom Driven Diagnosis 122SD and Coronado Workshop Manual Supplement 9 June 20...

Page 63: ...the leak can be tied to a single seal Mini Stato seals 2 when the leak cannot be tied to a single seal 0 50 oz yr and greater condemns these components Compressor shaft seal housing etc TXV Power Val...