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1. ACURA ServiceNews March 2002 Front Suspension Squeaks in Cold Weather On 96 98 TLs 97 98 CLs and 96 98 3 5RLs stiff lower arm ball joints in the front suspension can squeak in cold weather To stop the squeaking you need to exercise the ball joint Here s how 1 Pop the front suspension lower arm ball joint loose from the lower arm see section 18 in the appropriate S M for details 2 Move the tapered ball joint pin left and right and back and forth as far as you can 10 times in each direction 3 Move the tapered ball joint pin to the limit of its stroke then push it around the joint 10 times in a circular direction Reinstall the lower arm onto the ball joint 5 Repeat this procedure for the other side LEFT AND RIGHT AND LEFT AND RIGHT GREAT NOW CIRCULAR MOTION SET OF TEN REMEMBER GOOD FORM EVERYONE AND FEEL 4 I Owner s Manual Fix 02 MDX Oil Specs Owner s Manual The oil specification on pages 261 262 and the rear cover page are wrong The correct oil for the 02 MDX is 5W 30 not SW 20 The chart on page 262 should look like this WRONG gt lt J 20 o 20 40 60 80 100 F 30 20 10 o 10 20 30 40 C Ambient Temperature CORRECT 10W 30 aii 5W 30 PREFERRED 20 0 20 40 60 80 100 F 30 20 10 0 0 2 3 4 Ambient Temperature For a complete and accurate oil recommendation chart see the January 02 issue of S N Ne
2. help you diagnose and repair DTC P0171 and DTC P0172 problems Parameter Expected Values Long Term Fuel Trim LT FT or Air Fuel Feedback Average AF FB AVG LT FT or AF FB AVG normally reads 1 00 on the PGM Tester When the LT FT or AF FB AVG values reach 85 rich or 1 15 lean the MIL comes on and the appropriate DTC sets Short Term Fuel Trim ST FT or Air Fuel Feedback AF FB ST FT or AF FB normally fluctuates around 1 00 and should not hold a high or low value If the ST FT value is high or low find the driving condition using freeze data that causes the ST FT to peak Engine Coolant Temperature ECT 0 5 to 0 7 V engine at normal operating temperature Intake Air Temperature IAT 1 0 to 2 0 V engine at normal operating temperature Throttle Position TP Sensor 0 5 closed throttle to 4 5 V wide open throttle Barometric Pressure BARO 2 8 to 2 9 V at sea level 2 5 V at 5 000 feet Manifold Absolute Pressure MAP 0 8 to 1 0 V at idle no load Exhaust Gas Recirculation Valve Lift Sensor EGR VLS 1 1 to 1 25 V at idle Manifold Vacuum The manifold vacuum should be 20 inches or the equivalent MAP sensor voltage should be less than 1 0 V when idling at sea level no load If the MAP sensor voltage is higher than 1 0 V the engine has low manifold vacuum that will cause a rich mixture Some causes for low manifold vacuum are tight or leaking valv
3. stuck open and it is defective Replace the EGR valve e Ifthe EGR VLS value from the test drive is similar to the EGR VLS value on the freeze data the EGR valve is OK and isn t the cause of your misfire DTCs Look for other possible causes S M Fix 701 02 MDX Oil Specs The oil specifications on page 3 2 of the 2001 02 MDX Service Manual are wrong Correct them like this WRONG gt lt 20 0 20 40 60 80 100 F 30 20 10 o 10 20 30 aoc Ambient Temperature CORRECT 10w 30 e eee 5W 30 PREFERRED 20 0 20 40 60 80 100 F 30 20 10 0 10 20 30 40 Ambient Temperature For a complete and accurate oil recommendation chart see to the January 02 issue of S N Power Seat Won t Move 701 02 MDX Touring If you have a driver s or passenger s seat on an MDX Touring model that isn t working the harness may have been misrouted after someone worked near it Make sure this harness is routed above the front boss on the side seat trim Do not route the harness below the side seat trim mounting boss or the harness may become pinched or chafed and cause a short which can blow the No 2 No 3 No 4 or No 5 fuse in the passenger s under dash fuse relay box If the harness is damaged replace the harness FRONT BOSS Route the power seat harness over the top of the front boss Troubleshooting Multiple Indicators All Models ABS TCS and VSA control unit
4. es incorrect camshaft timing low compression or an EGR valve that s stuck open Fuel Pressure On models with vacuum operated fuel pressure regulators make sure you measure fuel pressure with the pressure regulator vacuum hose connected and disconnected Refer to the appropriate S M for fuel pressure specifications Fuel Injectors Connect the fuel pressure gauge and start the engine Turn off the engine slowly and carefully pinch the return hose and check the fuel pressure leak down rate If the fuel pressure decreases by more than 10 psi in 30 minutes an injector is leaking and causing a rich mixture Debris in the injector screens can cause DTC P0171 or P0172 If you find debris replace the injectors but find the source of contamination before installing the new injectors ECT and IAT sensor voltage should be the same when the engine is cold MAP and BARO sensor voltage should be the same with the ignition switch turned on and the engine off Measure Voltage Drops to Pinpoint Problems Measuring for voltage drops is one of the best ways to find unwanted resistance bad ground connector connection etc in a circuit or component It s a really easy and quick procedure and you can use it on both the ground and power sides of the circuit The tests are done with normal system voltage going through the circuit While checking for continuity with an ohmmeter lets you find simple opens and sho
5. roblem an analog voltmeter isn t sensitive enough oo ACURA ServiceNews ASE 2002 American Honda Motor Co Inc All Rights Reserved Published by AHM Service WE SUPPORT Communications 1919 Torrance Blvd Torrance fOe NRH CA 90501 2746 All suggestions become the National tette tor property of American Honda Motor Co Inc AUERVIGE sending a suggestion gives Honda permission to __ ttENSe publish it without further consideration BSN 23737 0203
6. rts easily measuring for voltage drops points you right to those elusive poor connections and bad switch or solenoid contacts that waste your time A voltage drop in either the power side or ground side of a circuit means the component isn t getting all the current it s supposed to from that circuit So it isn t going to work the way it should or it may not even work at all An engine that won t crank fast enough because of corroded battery connections is a classic example of a voltage drop To help you understand voltage drop let s take a quick look at Ohm s Law E I x R Since E is voltage I is current and R is resistance another way to express this equation is Voltage Current x Resistance Therefore when you have current flowing through a circuit with resistance you ll have a voltage drop To illustrate the voltage drop principle let s troubleshoot a light that s dimmer than normal First we ll check the power side of the circuit Connect the positive lead of your digital voltmeter to the side of the switch that s nearest the power source Then connect the negative lead to the side of the switch that s nearest the light Now turn on the light NOTE You can t check for a voltage drop unless the circuit is on remember there has to be current flow Even if the component in the circuit won t work at all turn it on POWER SIDE GROUND SIDE DIGITAL VOLTMETER Let s say your
7. s communicate with the ECM PCM If a DTC causes a loss of communication among these control units the loss can cause multiple indicators to come on For instance when the ABS TCS control unit stops getting data from the ECM PCM it sets a DTC such as TCS DTC 31 engine retard command PFINH signal This DTC doesn t mean there s a circuit or control unit failure it means the flow of data has stopped If you troubleshoot the PGM FI system or the ABS TCS first and clear the DTCs you ll most likely fix the problem As a general rule troubleshoot DTCs that aren t related to communication first For example if DTC P1676 FPTDR signal line failure is set and the ABS TCS control unit sets a TCS DTC 24 thru 27 TCS solenoid troubleshoot the TCS DTC problem first A second example If the ECM PCM sets DTC P1498 EGR valve position sensor circuit voltage high and the ABS TCS control unit sets TCS DTC 31 engine retard command PFINH signal troubleshoot DTC P1498 first DTC P0171 and DTC P0172 Troubleshooting Tips DTC P0171 fuel system too lean and DTC P0172 fuel system too rich can set when the ECM PCM makes adjustments to the fuel mixture that are out of range in relation to the input from the heated oxygen sensor HO2S Some Acura vehicles use a universal exhaust gas oxygen UEGO sensor You ll see the values for this sensor listed as Air Fuel Feedback AF FB on the PGM Tester display screen Here s a handy table to
8. ug 702 RSX Can t Turn Off the A C While in Defrost The 02 RSX has new heater control panel logic that prevents the user from turning the A C compressor off when in the defrost mode The logic for the RSX is very similar to the logic used in the 3 2TL the 3 2CL the RL and the MDX When defrost is selected the A C compressor turns on and fresh air is directed towards the windshield The defrost mode is set up this way to help improve defrosting performance Troubleshooting Multiple Misfire DTCs NOTE This article applies to 99 03 3 2TLs 01 03 3 2CLs and 01 02 MDXs When troubleshooting misfire DTCs P0301 thru P0306 with the PGM Tester look at the freeze data values for the throttle position TP sensor and the exhaust gas recirculation valve lift sensor EGR VLS If the EGR VLS value is more than 1 25 volts and the TP sensor value is 0 5 volt closed throttle the EGR valve opened when it should have been closed and it is defective Replace the EGR valve If the TP sensor value is more than 0 5 volt and the vehicle speed sensor VSS and RPM values indicate that the DTC was set while the vehicle was moving write down or print out the EGR VLS value Then drive the vehicle at the same VSS and RPM values as shown in the freeze data and note the EGR VLS value e Ifthe freeze data EGR VLS value is more than 1 25 volts but the EGR VLS value from the test drive is less than 1 25 volts the EGR valve was
9. voltmeter reads 4 0 V This means there s a voltage drop of 4 0 V in the switch The light s dim because it s only getting 8 0 V instead of 12 0 V That means there s a bad connection or dirty contacts resistance inside the switch On the other hand let s suppose there isn t enough voltage drop in the power side of the circuit to cause a problem less than 1 0 V probably only 0 1 to 0 2 V So now we ll check the ground side of the circuit Connect the positive lead of your voltmeter to the ground side of the light and the negative lead to a good body ground Look at your voltmeter if it s reading 3 0 V you ve found the bad connection resistance that s causing the light to dim POWER SIDE GROUND SIDE l FUSE BOX SWITCH LIGHT hH DIGITAL VOLTMETER While most of the circuits you troubleshoot are probably not this simple the principle remains are the same Remember these tips when measuring voltage drops e Find out if the voltage drop is on the power side or on the ground side e Measure for voltage drop from the power source to the component then from the component to ground e Pinpoint the exact location of the problem by referring to the appropriate ETM and measuring the voltage drop in each length of wire across each connector each fuse each splice and each switch in that circuit Make sure you use a digital voltmeter Since a voltage drop of less than 1 0 V is enough to cause a p
10. w Software for PGM Tester SN211 The latest PGM Tester software version SN211 1 21 02 was sent to your service manager on the February ACURALINK CD To load the software into the PGM Tester use your 8MB program card and the normal updating procedure For info about updating on the Interactive Network or on the DCS workstation or for general CD questions call the ACURALINK Support Center at 800 245 4343 For info on vehicle systems or using the PGM Tester call Special Tools at 800 346 6327 For warranty policy inquiries call Warranty at 310 783 3240 Here s some important info on SN211 e The new EVAP system function test has been expanded It now covers 98 99 2 3CLs 99 02 3 2TLs 01 02 3 2CLs and 02 RSXs More vehicles will be added in future software releases See S B 02 005 EVAP System Function Testing and Diagnostics With the PGM Tester found under Fuel and Emissions for details e Fuel tank pressure sensor FTPS has been added where it was missing from the EVAP system single and multiple solenoid function test e On 99 02 3 2TLs 01 02 3 2CLs and 01 02 MDXs don t use the PGM Tester idle adjustment feature it can cause an idle fluctuation that resembles a faulty intake air control IAC valve This problem will be fixed in the next software release e Automatic Transmission snapshots cannot be transmitted to Tech Line by the Data Transfer Module DTM Special tools is working on fixing this b

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